import sys from operator import add from itertools import product import pandas as pd import pandas.util.testing as tm import numpy as np import pytest import dask from dask.utils import ignoring, put_lines import dask.dataframe as dd from dask.dataframe.core import repartition_divisions, aca, _concat, Scalar from dask.dataframe.methods import boundary_slice from dask.dataframe.utils import (assert_eq, make_meta, assert_max_deps, PANDAS_VERSION) if PANDAS_VERSION >= '0.20.0': from pandas.io.formats import format as pandas_format else: from pandas.formats import format as pandas_format dsk = {('x', 0): pd.DataFrame({'a': [1, 2, 3], 'b': [4, 5, 6]}, index=[0, 1, 3]), ('x', 1): pd.DataFrame({'a': [4, 5, 6], 'b': [3, 2, 1]}, index=[5, 6, 8]), ('x', 2): pd.DataFrame({'a': [7, 8, 9], 'b': [0, 0, 0]}, index=[9, 9, 9])} meta = make_meta({'a': 'i8', 'b': 'i8'}, index=pd.Index([], 'i8')) d = dd.DataFrame(dsk, 'x', meta, [0, 5, 9, 9]) full = d.compute() def test_Dataframe(): expected = pd.Series([2, 3, 4, 5, 6, 7, 8, 9, 10], index=[0, 1, 3, 5, 6, 8, 9, 9, 9], name='a') assert_eq(d['a'] + 1, expected) tm.assert_index_equal(d.columns, pd.Index(['a', 'b'])) assert_eq(d[d['b'] > 2], full[full['b'] > 2]) assert_eq(d[['a', 'b']], full[['a', 'b']]) assert_eq(d.a, full.a) assert d.b.mean().compute() == full.b.mean() assert np.allclose(d.b.var().compute(), full.b.var()) assert np.allclose(d.b.std().compute(), full.b.std()) assert d.index._name == d.index._name # this is deterministic assert repr(d) def test_head_tail(): assert_eq(d.head(2), full.head(2)) assert_eq(d.head(3), full.head(3)) assert_eq(d.head(2), dsk[('x', 0)].head(2)) assert_eq(d['a'].head(2), full['a'].head(2)) assert_eq(d['a'].head(3), full['a'].head(3)) assert_eq(d['a'].head(2), dsk[('x', 0)]['a'].head(2)) assert (sorted(d.head(2, compute=False).dask) == sorted(d.head(2, compute=False).dask)) assert (sorted(d.head(2, compute=False).dask) != sorted(d.head(3, compute=False).dask)) assert_eq(d.tail(2), full.tail(2)) assert_eq(d.tail(3), full.tail(3)) assert_eq(d.tail(2), dsk[('x', 2)].tail(2)) assert_eq(d['a'].tail(2), full['a'].tail(2)) assert_eq(d['a'].tail(3), full['a'].tail(3)) assert_eq(d['a'].tail(2), dsk[('x', 2)]['a'].tail(2)) assert (sorted(d.tail(2, compute=False).dask) == sorted(d.tail(2, compute=False).dask)) assert (sorted(d.tail(2, compute=False).dask) != sorted(d.tail(3, compute=False).dask)) def test_head_npartitions(): assert_eq(d.head(5, npartitions=2), full.head(5)) assert_eq(d.head(5, npartitions=2, compute=False), full.head(5)) assert_eq(d.head(5, npartitions=-1), full.head(5)) assert_eq(d.head(7, npartitions=-1), full.head(7)) assert_eq(d.head(2, npartitions=-1), full.head(2)) with pytest.raises(ValueError): d.head(2, npartitions=5) @pytest.mark.skipif(sys.version_info[:2] == (3, 3), reason="Python3.3 uses pytest2.7.2, w/o warns method") def test_head_npartitions_warn(): with pytest.warns(None): d.head(100) with pytest.warns(None): d.head(7) with pytest.warns(None): d.head(7, npartitions=2) def test_index_head(): assert_eq(d.index.head(2), full.index[:2]) assert_eq(d.index.head(3), full.index[:3]) def test_Series(): assert isinstance(d.a, dd.Series) assert isinstance(d.a + 1, dd.Series) assert_eq((d + 1), full + 1) def test_Index(): for case in [pd.DataFrame(np.random.randn(10, 5), index=list('abcdefghij')), pd.DataFrame(np.random.randn(10, 5), index=pd.date_range('2011-01-01', freq='D', periods=10))]: ddf = dd.from_pandas(case, 3) assert_eq(ddf.index, case.index) pytest.raises(AttributeError, lambda: ddf.index.index) def test_Scalar(): val = np.int64(1) s = Scalar({('a', 0): val}, 'a', 'i8') assert hasattr(s, 'dtype') assert 'dtype' in dir(s) assert_eq(s, val) assert repr(s) == "dd.Scalar" val = pd.Timestamp('2001-01-01') s = Scalar({('a', 0): val}, 'a', val) assert not hasattr(s, 'dtype') assert 'dtype' not in dir(s) assert_eq(s, val) assert repr(s) == "dd.Scalar" def test_attributes(): assert 'a' in dir(d) assert 'foo' not in dir(d) pytest.raises(AttributeError, lambda: d.foo) df = dd.from_pandas(pd.DataFrame({'a b c': [1, 2, 3]}), npartitions=2) assert 'a b c' not in dir(df) df = dd.from_pandas(pd.DataFrame({'a': [1, 2], 5: [1, 2]}), npartitions=2) assert 'a' in dir(df) assert 5 not in dir(df) df = dd.from_pandas(tm.makeTimeDataFrame(), npartitions=3) pytest.raises(AttributeError, lambda: df.foo) def test_column_names(): tm.assert_index_equal(d.columns, pd.Index(['a', 'b'])) tm.assert_index_equal(d[['b', 'a']].columns, pd.Index(['b', 'a'])) assert d['a'].name == 'a' assert (d['a'] + 1).name == 'a' assert (d['a'] + d['b']).name is None def test_index_names(): assert d.index.name is None idx = pd.Index([0, 1, 2, 3, 4, 5, 6, 7, 8, 9], name='x') df = pd.DataFrame(np.random.randn(10, 5), idx) ddf = dd.from_pandas(df, 3) assert ddf.index.name == 'x' assert ddf.index.compute().name == 'x' @pytest.mark.parametrize( 'npartitions', [1, pytest.mark.xfail(2, reason='pandas join removes freq')] ) def test_timezone_freq(npartitions): s_naive = pd.Series(pd.date_range('20130101', periods=10)) s_aware = pd.Series(pd.date_range('20130101', periods=10, tz='US/Eastern')) pdf = pd.DataFrame({'tz': s_aware, 'notz': s_naive}) ddf = dd.from_pandas(pdf, npartitions=npartitions) assert pdf.tz[0].freq == ddf.compute().tz[0].freq == ddf.tz.compute()[0].freq def test_rename_columns(): # GH 819 df = pd.DataFrame({'a': [1, 2, 3, 4, 5, 6, 7], 'b': [7, 6, 5, 4, 3, 2, 1]}) ddf = dd.from_pandas(df, 2) ddf.columns = ['x', 'y'] df.columns = ['x', 'y'] tm.assert_index_equal(ddf.columns, pd.Index(['x', 'y'])) tm.assert_index_equal(ddf._meta.columns, pd.Index(['x', 'y'])) assert_eq(ddf, df) msg = r"Length mismatch: Expected axis has 2 elements, new values have 4 elements" with pytest.raises(ValueError) as err: ddf.columns = [1, 2, 3, 4] assert msg in str(err.value) # Multi-index columns df = pd.DataFrame({('A', '0') : [1, 2, 2, 3], ('B', 1) : [1, 2, 3, 4]}) ddf = dd.from_pandas(df, npartitions=2) df.columns = ['x', 'y'] ddf.columns = ['x', 'y'] tm.assert_index_equal(ddf.columns, pd.Index(['x', 'y'])) tm.assert_index_equal(ddf._meta.columns, pd.Index(['x', 'y'])) assert_eq(ddf, df) def test_rename_series(): # GH 819 s = pd.Series([1, 2, 3, 4, 5, 6, 7], name='x') ds = dd.from_pandas(s, 2) s.name = 'renamed' ds.name = 'renamed' assert s.name == 'renamed' assert_eq(ds, s) ind = s.index dind = ds.index ind.name = 'renamed' dind.name = 'renamed' assert ind.name == 'renamed' assert_eq(dind, ind) def test_describe(): # prepare test case which approx quantiles will be the same as actuals s = pd.Series(list(range(20)) * 4) df = pd.DataFrame({'a': list(range(20)) * 4, 'b': list(range(4)) * 20}) ds = dd.from_pandas(s, 4) ddf = dd.from_pandas(df, 4) assert_eq(s.describe(), ds.describe()) assert_eq(df.describe(), ddf.describe()) assert_eq(s.describe(), ds.describe(split_every=2)) assert_eq(df.describe(), ddf.describe(split_every=2)) assert ds.describe(split_every=2)._name != ds.describe()._name assert ddf.describe(split_every=2)._name != ddf.describe()._name # remove string columns df = pd.DataFrame({'a': list(range(20)) * 4, 'b': list(range(4)) * 20, 'c': list('abcd') * 20}) ddf = dd.from_pandas(df, 4) assert_eq(df.describe(), ddf.describe()) assert_eq(df.describe(), ddf.describe(split_every=2)) def test_describe_empty(): # https://github.com/dask/dask/issues/2326 ddf = dd.from_pandas(pd.DataFrame({"A": ['a', 'b']}), 2) with pytest.raises(ValueError) as rec: ddf.describe() assert 'DataFrame contains only non-numeric data.' in str(rec) with pytest.raises(ValueError) as rec: ddf.A.describe() assert 'Cannot compute ``describe`` on object dtype.' in str(rec) def test_cumulative(): df = pd.DataFrame(np.random.randn(100, 5), columns=list('abcde')) ddf = dd.from_pandas(df, 5) assert_eq(ddf.cumsum(), df.cumsum()) assert_eq(ddf.cumprod(), df.cumprod()) assert_eq(ddf.cummin(), df.cummin()) assert_eq(ddf.cummax(), df.cummax()) assert_eq(ddf.cumsum(axis=1), df.cumsum(axis=1)) assert_eq(ddf.cumprod(axis=1), df.cumprod(axis=1)) assert_eq(ddf.cummin(axis=1), df.cummin(axis=1)) assert_eq(ddf.cummax(axis=1), df.cummax(axis=1)) assert_eq(ddf.a.cumsum(), df.a.cumsum()) assert_eq(ddf.a.cumprod(), df.a.cumprod()) assert_eq(ddf.a.cummin(), df.a.cummin()) assert_eq(ddf.a.cummax(), df.a.cummax()) # With NaNs df = pd.DataFrame({'a': [1, 2, np.nan, 4, 5, 6, 7, 8], 'b': [1, 2, np.nan, np.nan, np.nan, 5, np.nan, np.nan], 'c': [np.nan] * 8}) ddf = dd.from_pandas(df, 3) assert_eq(df.cumsum(), ddf.cumsum()) assert_eq(df.cummin(), ddf.cummin()) assert_eq(df.cummax(), ddf.cummax()) assert_eq(df.cumprod(), ddf.cumprod()) assert_eq(df.cumsum(skipna=False), ddf.cumsum(skipna=False)) assert_eq(df.cummin(skipna=False), ddf.cummin(skipna=False)) assert_eq(df.cummax(skipna=False), ddf.cummax(skipna=False)) assert_eq(df.cumprod(skipna=False), ddf.cumprod(skipna=False)) assert_eq(df.cumsum(axis=1), ddf.cumsum(axis=1)) assert_eq(df.cummin(axis=1), ddf.cummin(axis=1)) assert_eq(df.cummax(axis=1), ddf.cummax(axis=1)) assert_eq(df.cumprod(axis=1), ddf.cumprod(axis=1)) assert_eq(df.cumsum(axis=1, skipna=False), ddf.cumsum(axis=1, skipna=False)) assert_eq(df.cummin(axis=1, skipna=False), ddf.cummin(axis=1, skipna=False)) assert_eq(df.cummax(axis=1, skipna=False), ddf.cummax(axis=1, skipna=False)) assert_eq(df.cumprod(axis=1, skipna=False), ddf.cumprod(axis=1, skipna=False)) def test_dropna(): df = pd.DataFrame({'x': [np.nan, 2, 3, 4, np.nan, 6], 'y': [1, 2, np.nan, 4, np.nan, np.nan], 'z': [1, 2, 3, 4, np.nan, np.nan]}, index=[10, 20, 30, 40, 50, 60]) ddf = dd.from_pandas(df, 3) assert_eq(ddf.x.dropna(), df.x.dropna()) assert_eq(ddf.y.dropna(), df.y.dropna()) assert_eq(ddf.z.dropna(), df.z.dropna()) assert_eq(ddf.dropna(), df.dropna()) assert_eq(ddf.dropna(how='all'), df.dropna(how='all')) assert_eq(ddf.dropna(subset=['x']), df.dropna(subset=['x'])) assert_eq(ddf.dropna(subset=['y', 'z']), df.dropna(subset=['y', 'z'])) assert_eq(ddf.dropna(subset=['y', 'z'], how='all'), df.dropna(subset=['y', 'z'], how='all')) @pytest.mark.parametrize('lower, upper', [(2, 5), (2.5, 3.5)]) def test_clip(lower, upper): df = pd.DataFrame({'a': [1, 2, 3, 4, 5, 6, 7, 8, 9], 'b': [3, 5, 2, 5, 7, 2, 4, 2, 4]}) ddf = dd.from_pandas(df, 3) s = pd.Series([1, 2, 3, 4, 5, 6, 7, 8, 9]) ds = dd.from_pandas(s, 3) assert_eq(ddf.clip(lower=lower, upper=upper), df.clip(lower=lower, upper=upper)) assert_eq(ddf.clip(lower=lower), df.clip(lower=lower)) assert_eq(ddf.clip(upper=upper), df.clip(upper=upper)) assert_eq(ds.clip(lower=lower, upper=upper), s.clip(lower=lower, upper=upper)) assert_eq(ds.clip(lower=lower), s.clip(lower=lower)) assert_eq(ds.clip(upper=upper), s.clip(upper=upper)) assert_eq(ddf.clip_lower(lower), df.clip_lower(lower)) assert_eq(ddf.clip_lower(upper), df.clip_lower(upper)) assert_eq(ddf.clip_upper(lower), df.clip_upper(lower)) assert_eq(ddf.clip_upper(upper), df.clip_upper(upper)) assert_eq(ds.clip_lower(lower), s.clip_lower(lower)) assert_eq(ds.clip_lower(upper), s.clip_lower(upper)) assert_eq(ds.clip_upper(lower), s.clip_upper(lower)) assert_eq(ds.clip_upper(upper), s.clip_upper(upper)) def test_where_mask(): pdf1 = pd.DataFrame({'a': [1, 2, 3, 4, 5, 6, 7, 8, 9], 'b': [3, 5, 2, 5, 7, 2, 4, 2, 4]}) ddf1 = dd.from_pandas(pdf1, 2) pdf2 = pd.DataFrame({'a': [True, False, True] * 3, 'b': [False, False, True] * 3}) ddf2 = dd.from_pandas(pdf2, 2) # different index pdf3 = pd.DataFrame({'a': [1, 2, 3, 4, 5, 6, 7, 8, 9], 'b': [3, 5, 2, 5, 7, 2, 4, 2, 4]}, index=[0, 1, 2, 3, 4, 5, 6, 7, 8]) ddf3 = dd.from_pandas(pdf3, 2) pdf4 = pd.DataFrame({'a': [True, False, True] * 3, 'b': [False, False, True] * 3}, index=[5, 6, 7, 8, 9, 10, 11, 12, 13]) ddf4 = dd.from_pandas(pdf4, 2) # different columns pdf5 = pd.DataFrame({'a': [1, 2, 3, 4, 5, 6, 7, 8, 9], 'b': [9, 4, 2, 6, 2, 3, 1, 6, 2], 'c': [5, 6, 7, 8, 9, 10, 11, 12, 13]}, index=[0, 1, 2, 3, 4, 5, 6, 7, 8]) ddf5 = dd.from_pandas(pdf5, 2) pdf6 = pd.DataFrame({'a': [True, False, True] * 3, 'b': [False, False, True] * 3, 'c': [False] * 9, 'd': [True] * 9}, index=[5, 6, 7, 8, 9, 10, 11, 12, 13]) ddf6 = dd.from_pandas(pdf6, 2) cases = [(ddf1, ddf2, pdf1, pdf2), (ddf1.repartition([0, 3, 6, 8]), ddf2, pdf1, pdf2), (ddf1, ddf4, pdf3, pdf4), (ddf3.repartition([0, 4, 6, 8]), ddf4.repartition([5, 9, 10, 13]), pdf3, pdf4), (ddf5, ddf6, pdf5, pdf6), (ddf5.repartition([0, 4, 7, 8]), ddf6, pdf5, pdf6), # use pd.DataFrame as cond (ddf1, pdf2, pdf1, pdf2), (ddf1, pdf4, pdf3, pdf4), (ddf5, pdf6, pdf5, pdf6)] for ddf, ddcond, pdf, pdcond in cases: assert isinstance(ddf, dd.DataFrame) assert isinstance(ddcond, (dd.DataFrame, pd.DataFrame)) assert isinstance(pdf, pd.DataFrame) assert isinstance(pdcond, pd.DataFrame) assert_eq(ddf.where(ddcond), pdf.where(pdcond)) assert_eq(ddf.mask(ddcond), pdf.mask(pdcond)) assert_eq(ddf.where(ddcond, -ddf), pdf.where(pdcond, -pdf)) assert_eq(ddf.mask(ddcond, -ddf), pdf.mask(pdcond, -pdf)) assert_eq(ddf.where(ddcond.a, -ddf), pdf.where(pdcond.a, -pdf)) assert_eq(ddf.mask(ddcond.a, -ddf), pdf.mask(pdcond.a, -pdf)) assert_eq(ddf.a.where(ddcond.a), pdf.a.where(pdcond.a)) assert_eq(ddf.a.mask(ddcond.a), pdf.a.mask(pdcond.a)) assert_eq(ddf.a.where(ddcond.a, -ddf.a), pdf.a.where(pdcond.a, -pdf.a)) assert_eq(ddf.a.mask(ddcond.a, -ddf.a), pdf.a.mask(pdcond.a, -pdf.a)) def test_map_partitions_multi_argument(): assert_eq(dd.map_partitions(lambda a, b: a + b, d.a, d.b), full.a + full.b) assert_eq(dd.map_partitions(lambda a, b, c: a + b + c, d.a, d.b, 1), full.a + full.b + 1) def test_map_partitions(): assert_eq(d.map_partitions(lambda df: df, meta=d), full) assert_eq(d.map_partitions(lambda df: df), full) result = d.map_partitions(lambda df: df.sum(axis=1)) assert_eq(result, full.sum(axis=1)) assert_eq(d.map_partitions(lambda df: 1), pd.Series([1, 1, 1], dtype=np.int64), check_divisions=False) x = Scalar({('x', 0): 1}, 'x', int) result = dd.map_partitions(lambda x: 2, x) assert result.dtype in (np.int32, np.int64) and result.compute() == 2 result = dd.map_partitions(lambda x: 4.0, x) assert result.dtype == np.float64 and result.compute() == 4.0 def test_map_partitions_names(): func = lambda x: x assert (sorted(dd.map_partitions(func, d, meta=d).dask) == sorted(dd.map_partitions(func, d, meta=d).dask)) assert (sorted(dd.map_partitions(lambda x: x, d, meta=d, token=1).dask) == sorted(dd.map_partitions(lambda x: x, d, meta=d, token=1).dask)) func = lambda x, y: x assert (sorted(dd.map_partitions(func, d, d, meta=d).dask) == sorted(dd.map_partitions(func, d, d, meta=d).dask)) def test_map_partitions_column_info(): df = pd.DataFrame({'x': [1, 2, 3, 4], 'y': [5, 6, 7, 8]}) a = dd.from_pandas(df, npartitions=2) b = dd.map_partitions(lambda x: x, a, meta=a) tm.assert_index_equal(b.columns, a.columns) assert_eq(df, b) b = dd.map_partitions(lambda x: x, a.x, meta=a.x) assert b.name == a.x.name assert_eq(df.x, b) b = dd.map_partitions(lambda x: x, a.x, meta=a.x) assert b.name == a.x.name assert_eq(df.x, b) b = dd.map_partitions(lambda df: df.x + df.y, a) assert isinstance(b, dd.Series) assert b.dtype == 'i8' b = dd.map_partitions(lambda df: df.x + 1, a, meta=('x', 'i8')) assert isinstance(b, dd.Series) assert b.name == 'x' assert b.dtype == 'i8' def test_map_partitions_method_names(): df = pd.DataFrame({'x': [1, 2, 3, 4], 'y': [5, 6, 7, 8]}) a = dd.from_pandas(df, npartitions=2) b = a.map_partitions(lambda x: x) assert isinstance(b, dd.DataFrame) tm.assert_index_equal(b.columns, a.columns) b = a.map_partitions(lambda df: df.x + 1) assert isinstance(b, dd.Series) assert b.dtype == 'i8' b = a.map_partitions(lambda df: df.x + 1, meta=('x', 'i8')) assert isinstance(b, dd.Series) assert b.name == 'x' assert b.dtype == 'i8' def test_map_partitions_keeps_kwargs_in_dict(): df = pd.DataFrame({'x': [1, 2, 3, 4], 'y': [5, 6, 7, 8]}) a = dd.from_pandas(df, npartitions=2) def f(s, x=1): return s + x b = a.x.map_partitions(f, x=5) assert "'x': 5" in str(b.dask) assert_eq(df.x + 5, b) assert a.x.map_partitions(f, x=5)._name != a.x.map_partitions(f, x=6)._name def test_drop_duplicates(): res = d.drop_duplicates() res2 = d.drop_duplicates(split_every=2) sol = full.drop_duplicates() assert_eq(res, sol) assert_eq(res2, sol) assert res._name != res2._name res = d.a.drop_duplicates() res2 = d.a.drop_duplicates(split_every=2) sol = full.a.drop_duplicates() assert_eq(res, sol) assert_eq(res2, sol) assert res._name != res2._name res = d.index.drop_duplicates() res2 = d.index.drop_duplicates(split_every=2) sol = full.index.drop_duplicates() assert_eq(res, sol) assert_eq(res2, sol) assert res._name != res2._name with pytest.raises(NotImplementedError): d.drop_duplicates(keep=False) def test_drop_duplicates_subset(): df = pd.DataFrame({'x': [1, 2, 3, 1, 2, 3], 'y': ['a', 'a', 'b', 'b', 'c', 'c']}) ddf = dd.from_pandas(df, npartitions=2) for kwarg in [{'keep': 'first'}, {'keep': 'last'}]: assert_eq(df.x.drop_duplicates(**kwarg), ddf.x.drop_duplicates(**kwarg)) for ss in [['x'], 'y', ['x', 'y']]: assert_eq(df.drop_duplicates(subset=ss, **kwarg), ddf.drop_duplicates(subset=ss, **kwarg)) def test_get_partition(): pdf = pd.DataFrame(np.random.randn(10, 5), columns=list('abcde')) ddf = dd.from_pandas(pdf, 3) assert ddf.divisions == (0, 4, 8, 9) # DataFrame div1 = ddf.get_partition(0) assert isinstance(div1, dd.DataFrame) assert_eq(div1, pdf.loc[0:3]) div2 = ddf.get_partition(1) assert_eq(div2, pdf.loc[4:7]) div3 = ddf.get_partition(2) assert_eq(div3, pdf.loc[8:9]) assert len(div1) + len(div2) + len(div3) == len(pdf) # Series div1 = ddf.a.get_partition(0) assert isinstance(div1, dd.Series) assert_eq(div1, pdf.a.loc[0:3]) div2 = ddf.a.get_partition(1) assert_eq(div2, pdf.a.loc[4:7]) div3 = ddf.a.get_partition(2) assert_eq(div3, pdf.a.loc[8:9]) assert len(div1) + len(div2) + len(div3) == len(pdf.a) with pytest.raises(ValueError): ddf.get_partition(-1) with pytest.raises(ValueError): ddf.get_partition(3) def test_ndim(): assert (d.ndim == 2) assert (d.a.ndim == 1) assert (d.index.ndim == 1) def test_dtype(): assert (d.dtypes == full.dtypes).all() def test_value_counts(): df = pd.DataFrame({'x': [1, 2, 1, 3, 3, 1, 4]}) ddf = dd.from_pandas(df, npartitions=3) result = ddf.x.value_counts() expected = df.x.value_counts() assert_eq(result, expected) result2 = ddf.x.value_counts(split_every=2) assert_eq(result2, expected) assert result._name != result2._name def test_unique(): pdf = pd.DataFrame({'x': [1, 2, 1, 3, 3, 1, 4, 2, 3, 1], 'y': ['a', 'c', 'b', np.nan, 'c', 'b', 'a', 'd', np.nan, 'a']}) ddf = dd.from_pandas(pdf, npartitions=3) assert_eq(ddf.x.unique(), pd.Series(pdf.x.unique(), name='x')) assert_eq(ddf.y.unique(), pd.Series(pdf.y.unique(), name='y')) assert_eq(ddf.x.unique(split_every=2), pd.Series(pdf.x.unique(), name='x')) assert_eq(ddf.y.unique(split_every=2), pd.Series(pdf.y.unique(), name='y')) assert ddf.x.unique(split_every=2)._name != ddf.x.unique()._name def test_isin(): assert_eq(d.a.isin([0, 1, 2]), full.a.isin([0, 1, 2])) assert_eq(d.a.isin(pd.Series([0, 1, 2])), full.a.isin(pd.Series([0, 1, 2]))) def test_len(): assert len(d) == len(full) assert len(d.a) == len(full.a) def test_size(): assert_eq(d.size, full.size) assert_eq(d.a.size, full.a.size) assert_eq(d.index.size, full.index.size) def test_nbytes(): assert_eq(d.a.nbytes, full.a.nbytes) assert_eq(d.index.nbytes, full.index.nbytes) def test_quantile(): # series / multiple result = d.b.quantile([.3, .7]) exp = full.b.quantile([.3, .7]) # result may different assert len(result) == 2 assert result.divisions == (.3, .7) assert_eq(result.index, exp.index) assert isinstance(result, dd.Series) result = result.compute() assert isinstance(result, pd.Series) assert result.iloc[0] == 0 assert 5 < result.iloc[1] < 6 # index s = pd.Series(np.arange(10), index=np.arange(10)) ds = dd.from_pandas(s, 2) result = ds.index.quantile([.3, .7]) exp = s.quantile([.3, .7]) assert len(result) == 2 assert result.divisions == (.3, .7) assert_eq(result.index, exp.index) assert isinstance(result, dd.Series) result = result.compute() assert isinstance(result, pd.Series) assert 1 < result.iloc[0] < 2 assert 7 < result.iloc[1] < 8 # series / single result = d.b.quantile(.5) exp = full.b.quantile(.5) # result may different assert isinstance(result, dd.core.Scalar) result = result.compute() assert 4 < result < 6 def test_empty_quantile(): result = d.b.quantile([]) exp = full.b.quantile([]) assert result.divisions == (None, None) # because of a pandas bug, name is not preserved # https://github.com/pydata/pandas/pull/10881 assert result.name == 'b' assert result.compute().name == 'b' assert_eq(result, exp, check_names=False) def test_dataframe_quantile(): # column X is for test column order and result division df = pd.DataFrame({'A': np.arange(20), 'X': np.arange(20, 40), 'B': np.arange(10, 30), 'C': ['a', 'b', 'c', 'd'] * 5}, columns=['A', 'X', 'B', 'C']) ddf = dd.from_pandas(df, 3) result = ddf.quantile() assert result.npartitions == 1 assert result.divisions == ('A', 'X') result = result.compute() assert isinstance(result, pd.Series) tm.assert_index_equal(result.index, pd.Index(['A', 'X', 'B'])) assert (result > pd.Series([16, 36, 26], index=['A', 'X', 'B'])).all() assert (result < pd.Series([17, 37, 27], index=['A', 'X', 'B'])).all() result = ddf.quantile([0.25, 0.75]) assert result.npartitions == 1 assert result.divisions == (0.25, 0.75) result = result.compute() assert isinstance(result, pd.DataFrame) tm.assert_index_equal(result.index, pd.Index([0.25, 0.75])) tm.assert_index_equal(result.columns, pd.Index(['A', 'X', 'B'])) minexp = pd.DataFrame([[1, 21, 11], [17, 37, 27]], index=[0.25, 0.75], columns=['A', 'X', 'B']) assert (result > minexp).all().all() maxexp = pd.DataFrame([[2, 22, 12], [18, 38, 28]], index=[0.25, 0.75], columns=['A', 'X', 'B']) assert (result < maxexp).all().all() assert_eq(ddf.quantile(axis=1), df.quantile(axis=1)) pytest.raises(ValueError, lambda: ddf.quantile([0.25, 0.75], axis=1)) def test_index(): assert_eq(d.index, full.index) def test_assign(): d_unknown = dd.from_pandas(full, npartitions=3, sort=False) assert not d_unknown.known_divisions res = d.assign(c=1, d='string', e=d.a.sum(), f=d.a + d.b) res_unknown = d_unknown.assign(c=1, d='string', e=d_unknown.a.sum(), f=d_unknown.a + d_unknown.b) sol = full.assign(c=1, d='string', e=full.a.sum(), f=full.a + full.b) assert_eq(res, sol) assert_eq(res_unknown, sol) res = d.assign(c=full.a + 1) assert_eq(res, full.assign(c=full.a + 1)) # divisions unknown won't work with pandas with pytest.raises(ValueError): d_unknown.assign(c=full.a + 1) # unsupported type with pytest.raises(TypeError): d.assign(c=list(range(9))) # Fails when assigning known divisions to unknown divisions with pytest.raises(ValueError): d_unknown.assign(foo=d.a) # Fails when assigning unknown divisions to known divisions with pytest.raises(ValueError): d.assign(foo=d_unknown.a) def test_map(): assert_eq(d.a.map(lambda x: x + 1), full.a.map(lambda x: x + 1)) lk = dict((v, v + 1) for v in full.a.values) assert_eq(d.a.map(lk), full.a.map(lk)) assert_eq(d.b.map(lk), full.b.map(lk)) lk = pd.Series(lk) assert_eq(d.a.map(lk), full.a.map(lk)) assert_eq(d.b.map(lk), full.b.map(lk)) assert_eq(d.b.map(lk, meta=d.b), full.b.map(lk)) assert_eq(d.b.map(lk, meta=('b', 'i8')), full.b.map(lk)) pytest.raises(TypeError, lambda: d.a.map(d.b)) def test_concat(): x = _concat([pd.DataFrame(columns=['a', 'b']), pd.DataFrame(columns=['a', 'b'])]) assert list(x.columns) == ['a', 'b'] assert len(x) == 0 def test_args(): e = d.assign(c=d.a + 1) f = type(e)(*e._args) assert_eq(e, f) assert_eq(d.a, type(d.a)(*d.a._args)) assert_eq(d.a.sum(), type(d.a.sum())(*d.a.sum()._args)) def test_known_divisions(): assert d.known_divisions df = dd.DataFrame(dsk, 'x', meta, divisions=[None, None, None]) assert not df.known_divisions def test_unknown_divisions(): dsk = {('x', 0): pd.DataFrame({'a': [1, 2, 3], 'b': [4, 5, 6]}), ('x', 1): pd.DataFrame({'a': [4, 5, 6], 'b': [3, 2, 1]}), ('x', 2): pd.DataFrame({'a': [7, 8, 9], 'b': [0, 0, 0]})} meta = make_meta({'a': 'i8', 'b': 'i8'}) d = dd.DataFrame(dsk, 'x', meta, [None, None, None, None]) full = d.compute(get=dask.get) assert_eq(d.a.sum(), full.a.sum()) assert_eq(d.a + d.b + 1, full.a + full.b + 1) @pytest.mark.parametrize('join', ['inner', 'outer', 'left', 'right']) def test_align(join): df1a = pd.DataFrame({'A': np.random.randn(10), 'B': np.random.randn(10)}, index=[1, 12, 5, 6, 3, 9, 10, 4, 13, 11]) df1b = pd.DataFrame({'A': np.random.randn(10), 'B': np.random.randn(10)}, index=[0, 3, 2, 10, 5, 6, 7, 8, 12, 13]) ddf1a = dd.from_pandas(df1a, 3) ddf1b = dd.from_pandas(df1b, 3) # DataFrame res1, res2 = ddf1a.align(ddf1b, join=join) exp1, exp2 = df1a.align(df1b, join=join) assert assert_eq(res1, exp1) assert assert_eq(res2, exp2) # Series res1, res2 = ddf1a['A'].align(ddf1b['B'], join=join) exp1, exp2 = df1a['A'].align(df1b['B'], join=join) assert assert_eq(res1, exp1) assert assert_eq(res2, exp2) # DataFrame with fill_value res1, res2 = ddf1a.align(ddf1b, join=join, fill_value=1) exp1, exp2 = df1a.align(df1b, join=join, fill_value=1) assert assert_eq(res1, exp1) assert assert_eq(res2, exp2) # Series res1, res2 = ddf1a['A'].align(ddf1b['B'], join=join, fill_value=1) exp1, exp2 = df1a['A'].align(df1b['B'], join=join, fill_value=1) assert assert_eq(res1, exp1) assert assert_eq(res2, exp2) @pytest.mark.parametrize('join', ['inner', 'outer', 'left', 'right']) def test_align_axis(join): df1a = pd.DataFrame({'A': np.random.randn(10), 'B': np.random.randn(10), 'C': np.random.randn(10)}, index=[1, 12, 5, 6, 3, 9, 10, 4, 13, 11]) df1b = pd.DataFrame({'B': np.random.randn(10), 'C': np.random.randn(10), 'D': np.random.randn(10)}, index=[0, 3, 2, 10, 5, 6, 7, 8, 12, 13]) ddf1a = dd.from_pandas(df1a, 3) ddf1b = dd.from_pandas(df1b, 3) res1, res2 = ddf1a.align(ddf1b, join=join, axis=0) exp1, exp2 = df1a.align(df1b, join=join, axis=0) assert assert_eq(res1, exp1) assert assert_eq(res2, exp2) res1, res2 = ddf1a.align(ddf1b, join=join, axis=1) exp1, exp2 = df1a.align(df1b, join=join, axis=1) assert assert_eq(res1, exp1) assert assert_eq(res2, exp2) res1, res2 = ddf1a.align(ddf1b, join=join, axis='index') exp1, exp2 = df1a.align(df1b, join=join, axis='index') assert assert_eq(res1, exp1) assert assert_eq(res2, exp2) res1, res2 = ddf1a.align(ddf1b, join=join, axis='columns') exp1, exp2 = df1a.align(df1b, join=join, axis='columns') assert assert_eq(res1, exp1) assert assert_eq(res2, exp2) # invalid with pytest.raises(ValueError): ddf1a.align(ddf1b, join=join, axis='XXX') with pytest.raises(ValueError): ddf1a['A'].align(ddf1b['B'], join=join, axis=1) def test_combine(): df1 = pd.DataFrame({'A': np.random.choice([1, 2, np.nan], 100), 'B': np.random.choice(['a', 'b', np.nan], 100)}) df2 = pd.DataFrame({'A': np.random.choice([1, 2, 3], 100), 'B': np.random.choice(['a', 'b', 'c'], 100)}) ddf1 = dd.from_pandas(df1, 4) ddf2 = dd.from_pandas(df2, 5) first = lambda a, b: a # DataFrame for da, db, a, b in [(ddf1, ddf2, df1, df2), (ddf1.A, ddf2.A, df1.A, df2.A), (ddf1.B, ddf2.B, df1.B, df2.B)]: for func, fill_value in [(add, None), (add, 100), (first, None)]: sol = a.combine(b, func, fill_value=fill_value) assert_eq(da.combine(db, func, fill_value=fill_value), sol) assert_eq(da.combine(b, func, fill_value=fill_value), sol) assert_eq(ddf1.combine(ddf2, add, overwrite=False), df1.combine(df2, add, overwrite=False)) assert da.combine(db, add)._name == da.combine(db, add)._name def test_combine_first(): df1 = pd.DataFrame({'A': np.random.choice([1, 2, np.nan], 100), 'B': np.random.choice(['a', 'b', np.nan], 100)}) df2 = pd.DataFrame({'A': np.random.choice([1, 2, 3], 100), 'B': np.random.choice(['a', 'b', 'c'], 100)}) ddf1 = dd.from_pandas(df1, 4) ddf2 = dd.from_pandas(df2, 5) # DataFrame assert_eq(ddf1.combine_first(ddf2), df1.combine_first(df2)) assert_eq(ddf1.combine_first(df2), df1.combine_first(df2)) # Series assert_eq(ddf1.A.combine_first(ddf2.A), df1.A.combine_first(df2.A)) assert_eq(ddf1.A.combine_first(df2.A), df1.A.combine_first(df2.A)) assert_eq(ddf1.B.combine_first(ddf2.B), df1.B.combine_first(df2.B)) assert_eq(ddf1.B.combine_first(df2.B), df1.B.combine_first(df2.B)) def test_dataframe_picklable(): from pickle import loads, dumps cloudpickle = pytest.importorskip('cloudpickle') cp_dumps = cloudpickle.dumps d = tm.makeTimeDataFrame() df = dd.from_pandas(d, npartitions=3) df = df + 2 # dataframe df2 = loads(dumps(df)) assert_eq(df, df2) df2 = loads(cp_dumps(df)) assert_eq(df, df2) # series a2 = loads(dumps(df.A)) assert_eq(df.A, a2) a2 = loads(cp_dumps(df.A)) assert_eq(df.A, a2) # index i2 = loads(dumps(df.index)) assert_eq(df.index, i2) i2 = loads(cp_dumps(df.index)) assert_eq(df.index, i2) # scalar # lambdas are present, so only test cloudpickle s = df.A.sum() s2 = loads(cp_dumps(s)) assert_eq(s, s2) def test_random_partitions(): a, b = d.random_split([0.5, 0.5], 42) assert isinstance(a, dd.DataFrame) assert isinstance(b, dd.DataFrame) assert a._name != b._name assert len(a.compute()) + len(b.compute()) == len(full) a2, b2 = d.random_split([0.5, 0.5], 42) assert a2._name == a._name assert b2._name == b._name parts = d.random_split([0.4, 0.5, 0.1], 42) names = set([p._name for p in parts]) names.update([a._name, b._name]) assert len(names) == 5 with pytest.raises(ValueError): d.random_split([0.4, 0.5], 42) def test_series_round(): ps = pd.Series([1.123, 2.123, 3.123, 1.234, 2.234, 3.234], name='a') s = dd.from_pandas(ps, npartitions=3) assert_eq(s.round(), ps.round()) @pytest.mark.slow def test_repartition(): def _check_split_data(orig, d): """Check data is split properly""" keys = [k for k in d.dask if k[0].startswith('repartition-split')] keys = sorted(keys) sp = pd.concat([d._get(d.dask, k) for k in keys]) assert_eq(orig, sp) assert_eq(orig, d) df = pd.DataFrame({'x': [1, 2, 3, 4, 5, 6], 'y': list('abdabd')}, index=[10, 20, 30, 40, 50, 60]) a = dd.from_pandas(df, 2) b = a.repartition(divisions=[10, 20, 50, 60]) assert b.divisions == (10, 20, 50, 60) assert_eq(a, b) assert_eq(a._get(b.dask, (b._name, 0)), df.iloc[:1]) for div in [[20, 60], [10, 50], [1], # first / last element mismatch [0, 60], [10, 70], # do not allow to expand divisions by default [10, 50, 20, 60], # not sorted [10, 10, 20, 60]]: # not unique (last element can be duplicated) pytest.raises(ValueError, lambda: a.repartition(divisions=div)) pdf = pd.DataFrame(np.random.randn(7, 5), columns=list('abxyz')) for p in range(1, 7): ddf = dd.from_pandas(pdf, p) assert_eq(ddf, pdf) for div in [[0, 6], [0, 6, 6], [0, 5, 6], [0, 4, 6, 6], [0, 2, 6], [0, 2, 6, 6], [0, 2, 3, 6, 6], [0, 1, 2, 3, 4, 5, 6, 6]]: rddf = ddf.repartition(divisions=div) _check_split_data(ddf, rddf) assert rddf.divisions == tuple(div) assert_eq(pdf, rddf) rds = ddf.x.repartition(divisions=div) _check_split_data(ddf.x, rds) assert rds.divisions == tuple(div) assert_eq(pdf.x, rds) # expand divisions for div in [[-5, 10], [-2, 3, 5, 6], [0, 4, 5, 9, 10]]: rddf = ddf.repartition(divisions=div, force=True) _check_split_data(ddf, rddf) assert rddf.divisions == tuple(div) assert_eq(pdf, rddf) rds = ddf.x.repartition(divisions=div, force=True) _check_split_data(ddf.x, rds) assert rds.divisions == tuple(div) assert_eq(pdf.x, rds) pdf = pd.DataFrame({'x': [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 'y': [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]}, index=list('abcdefghij')) for p in range(1, 7): ddf = dd.from_pandas(pdf, p) assert_eq(ddf, pdf) for div in [list('aj'), list('ajj'), list('adj'), list('abfj'), list('ahjj'), list('acdj'), list('adfij'), list('abdefgij'), list('abcdefghij')]: rddf = ddf.repartition(divisions=div) _check_split_data(ddf, rddf) assert rddf.divisions == tuple(div) assert_eq(pdf, rddf) rds = ddf.x.repartition(divisions=div) _check_split_data(ddf.x, rds) assert rds.divisions == tuple(div) assert_eq(pdf.x, rds) # expand divisions for div in [list('Yadijm'), list('acmrxz'), list('Yajz')]: rddf = ddf.repartition(divisions=div, force=True) _check_split_data(ddf, rddf) assert rddf.divisions == tuple(div) assert_eq(pdf, rddf) rds = ddf.x.repartition(divisions=div, force=True) _check_split_data(ddf.x, rds) assert rds.divisions == tuple(div) assert_eq(pdf.x, rds) def test_repartition_divisions(): result = repartition_divisions([0, 6], [0, 6, 6], 'a', 'b', 'c') assert result == {('b', 0): (boundary_slice, ('a', 0), 0, 6, False), ('b', 1): (boundary_slice, ('a', 0), 6, 6, True), ('c', 0): ('b', 0), ('c', 1): ('b', 1)} result = repartition_divisions([1, 3, 7], [1, 4, 6, 7], 'a', 'b', 'c') assert result == {('b', 0): (boundary_slice, ('a', 0), 1, 3, False), ('b', 1): (boundary_slice, ('a', 1), 3, 4, False), ('b', 2): (boundary_slice, ('a', 1), 4, 6, False), ('b', 3): (boundary_slice, ('a', 1), 6, 7, True), ('c', 0): (pd.concat, [('b', 0), ('b', 1)]), ('c', 1): ('b', 2), ('c', 2): ('b', 3)} def test_repartition_on_pandas_dataframe(): df = pd.DataFrame({'x': [1, 2, 3, 4, 5, 6], 'y': list('abdabd')}, index=[10, 20, 30, 40, 50, 60]) ddf = dd.repartition(df, divisions=[10, 20, 50, 60]) assert isinstance(ddf, dd.DataFrame) assert ddf.divisions == (10, 20, 50, 60) assert_eq(ddf, df) ddf = dd.repartition(df.y, divisions=[10, 20, 50, 60]) assert isinstance(ddf, dd.Series) assert ddf.divisions == (10, 20, 50, 60) assert_eq(ddf, df.y) @pytest.mark.parametrize('use_index', [True, False]) @pytest.mark.parametrize('n', [1, 2, 4, 5]) @pytest.mark.parametrize('k', [1, 2, 4, 5]) @pytest.mark.parametrize('dtype', [int, float, 'M8[ns]']) @pytest.mark.parametrize('transform', [lambda df: df, lambda df: df.x]) def test_repartition_npartitions(use_index, n, k, dtype, transform): df = pd.DataFrame({'x': [1, 2, 3, 4, 5, 6] * 10, 'y': list('abdabd') * 10}, index=pd.Series([10, 20, 30, 40, 50, 60] * 10, dtype=dtype)) df = transform(df) a = dd.from_pandas(df, npartitions=n, sort=use_index) b = a.repartition(npartitions=k) assert_eq(a, b) assert b.npartitions == k parts = dask.get(b.dask, b._keys()) assert all(map(len, parts)) def test_repartition_npartitions_same_limits(): df = pd.DataFrame({'x': [1, 2, 3]}, index=[pd.Timestamp('2017-05-09 00:00:00.006000'), pd.Timestamp('2017-05-09 02:45:00.017999'), pd.Timestamp('2017-05-09 05:59:58.938999')]) ddf = dd.from_pandas(df, npartitions=2) ddf.repartition(npartitions=10) def test_repartition_object_index(): df = pd.DataFrame({'x': [1, 2, 3, 4, 5, 6] * 10}, index=list('abdabd') * 10) a = dd.from_pandas(df, npartitions=5) b = a.repartition(npartitions=2) assert b.npartitions == 2 assert_eq(b, df) b = a.repartition(npartitions=10) assert b.npartitions == 10 assert_eq(b, df) assert not b.known_divisions @pytest.mark.slow @pytest.mark.parametrize('npartitions', [1, 20, 243]) @pytest.mark.parametrize('freq', ['1D', '7D', '28h']) @pytest.mark.parametrize('end', ['2000-04-15', '2000-04-15 12:37:01']) @pytest.mark.parametrize('start', ['2000-01-01', '2000-01-01 12:30:00']) def test_repartition_freq(npartitions, freq, start, end): start = pd.Timestamp(start) end = pd.Timestamp(end) ind = pd.DatetimeIndex(start=start, end=end, freq='60s') df = pd.DataFrame({'x': np.arange(len(ind))}, index=ind) ddf = dd.from_pandas(df, npartitions=npartitions, name='x') ddf2 = ddf.repartition(freq=freq) assert_eq(ddf2, df) def test_repartition_freq_divisions(): df = pd.DataFrame({'x': np.random.random(10)}, index=pd.DatetimeIndex(np.random.random(10) * 100e9)) ddf = dd.from_pandas(df, npartitions=3) ddf2 = ddf.repartition(freq='15s') for div in ddf2.divisions[1:-1]: assert div == div.round('15s') assert ddf2.divisions[0] == df.index.min() assert ddf2.divisions[-1] == df.index.max() assert_eq(ddf2, ddf2) def test_repartition_freq_errors(): df = pd.DataFrame({'x': [1, 2, 3]}) ddf = dd.from_pandas(df, npartitions=1) with pytest.raises(TypeError) as info: ddf.repartition(freq='1s') assert 'only' in str(info.value) assert 'timeseries' in str(info.value) def test_embarrassingly_parallel_operations(): df = pd.DataFrame({'x': [1, 2, 3, 4, None, 6], 'y': list('abdabd')}, index=[10, 20, 30, 40, 50, 60]) a = dd.from_pandas(df, 2) assert_eq(a.x.astype('float32'), df.x.astype('float32')) assert a.x.astype('float32').compute().dtype == 'float32' assert_eq(a.x.dropna(), df.x.dropna()) assert_eq(a.x.between(2, 4), df.x.between(2, 4)) assert_eq(a.x.clip(2, 4), df.x.clip(2, 4)) assert_eq(a.x.notnull(), df.x.notnull()) assert_eq(a.x.isnull(), df.x.isnull()) assert_eq(a.notnull(), df.notnull()) assert_eq(a.isnull(), df.isnull()) assert len(a.sample(0.5).compute()) < len(df) def test_fillna(): df = tm.makeMissingDataframe(0.8, 42) ddf = dd.from_pandas(df, npartitions=5, sort=False) assert_eq(ddf.fillna(100), df.fillna(100)) assert_eq(ddf.A.fillna(100), df.A.fillna(100)) assert_eq(ddf.fillna(method='pad'), df.fillna(method='pad')) assert_eq(ddf.A.fillna(method='pad'), df.A.fillna(method='pad')) assert_eq(ddf.fillna(method='bfill'), df.fillna(method='bfill')) assert_eq(ddf.A.fillna(method='bfill'), df.A.fillna(method='bfill')) assert_eq(ddf.fillna(method='pad', limit=2), df.fillna(method='pad', limit=2)) assert_eq(ddf.A.fillna(method='pad', limit=2), df.A.fillna(method='pad', limit=2)) assert_eq(ddf.fillna(method='bfill', limit=2), df.fillna(method='bfill', limit=2)) assert_eq(ddf.A.fillna(method='bfill', limit=2), df.A.fillna(method='bfill', limit=2)) assert_eq(ddf.fillna(100, axis=1), df.fillna(100, axis=1)) assert_eq(ddf.fillna(method='pad', axis=1), df.fillna(method='pad', axis=1)) assert_eq(ddf.fillna(method='pad', limit=2, axis=1), df.fillna(method='pad', limit=2, axis=1)) pytest.raises(ValueError, lambda: ddf.A.fillna(0, axis=1)) pytest.raises(NotImplementedError, lambda: ddf.fillna(0, limit=10)) pytest.raises(NotImplementedError, lambda: ddf.fillna(0, limit=10, axis=1)) df = tm.makeMissingDataframe(0.2, 42) ddf = dd.from_pandas(df, npartitions=5, sort=False) pytest.raises(ValueError, lambda: ddf.fillna(method='pad').compute()) assert_eq(df.fillna(method='pad', limit=3), ddf.fillna(method='pad', limit=3)) def test_fillna_multi_dataframe(): df = tm.makeMissingDataframe(0.8, 42) ddf = dd.from_pandas(df, npartitions=5, sort=False) assert_eq(ddf.A.fillna(ddf.B), df.A.fillna(df.B)) assert_eq(ddf.B.fillna(ddf.A), df.B.fillna(df.A)) def test_ffill_bfill(): df = tm.makeMissingDataframe(0.8, 42) ddf = dd.from_pandas(df, npartitions=5, sort=False) assert_eq(ddf.ffill(), df.ffill()) assert_eq(ddf.bfill(), df.bfill()) assert_eq(ddf.ffill(axis=1), df.ffill(axis=1)) assert_eq(ddf.bfill(axis=1), df.bfill(axis=1)) def test_sample(): df = pd.DataFrame({'x': [1, 2, 3, 4, None, 6], 'y': list('abdabd')}, index=[10, 20, 30, 40, 50, 60]) a = dd.from_pandas(df, 2) b = a.sample(0.5) assert_eq(b, b) c = a.sample(0.5, random_state=1234) d = a.sample(0.5, random_state=1234) assert_eq(c, d) assert a.sample(0.5)._name != a.sample(0.5)._name def test_sample_without_replacement(): df = pd.DataFrame({'x': [1, 2, 3, 4, None, 6], 'y': list('abdabd')}, index=[10, 20, 30, 40, 50, 60]) a = dd.from_pandas(df, 2) b = a.sample(0.7, replace=False) bb = b.index.compute() assert len(bb) == len(set(bb)) def test_datetime_accessor(): df = pd.DataFrame({'x': [1, 2, 3, 4]}) df['x'] = df.x.astype('M8[us]') a = dd.from_pandas(df, 2) assert 'date' in dir(a.x.dt) # pandas loses Series.name via datetime accessor # see https://github.com/pydata/pandas/issues/10712 assert_eq(a.x.dt.date, df.x.dt.date, check_names=False) # to_pydatetime returns a numpy array in pandas, but a Series in dask assert_eq(a.x.dt.to_pydatetime(), pd.Series(df.x.dt.to_pydatetime(), index=df.index, dtype=object)) assert set(a.x.dt.date.dask) == set(a.x.dt.date.dask) assert set(a.x.dt.to_pydatetime().dask) == set(a.x.dt.to_pydatetime().dask) def test_str_accessor(): df = pd.DataFrame({'x': ['a', 'b', 'c', 'D'], 'y': [1, 2, 3, 4]}, index=['e', 'f', 'g', 'H']) a = dd.from_pandas(df, 2, sort=False) # Check that str not in dir/hasattr for non-object columns assert 'str' not in dir(a.y) assert not hasattr(a.y, 'str') assert 'upper' in dir(a.x.str) assert_eq(a.x.str.upper(), df.x.str.upper()) assert set(a.x.str.upper().dask) == set(a.x.str.upper().dask) assert 'upper' in dir(a.index.str) assert_eq(a.index.str.upper(), df.index.str.upper()) assert set(a.index.str.upper().dask) == set(a.index.str.upper().dask) # make sure to pass thru args & kwargs assert 'contains' in dir(a.x.str) assert_eq(a.x.str.contains('a'), df.x.str.contains('a')) assert set(a.x.str.contains('a').dask) == set(a.x.str.contains('a').dask) assert_eq(a.x.str.contains('d', case=False), df.x.str.contains('d', case=False)) assert set(a.x.str.contains('d', case=False).dask) == set(a.x.str.contains('d', case=False).dask) for na in [True, False]: assert_eq(a.x.str.contains('a', na=na), df.x.str.contains('a', na=na)) assert set(a.x.str.contains('a', na=na).dask) == set(a.x.str.contains('a', na=na).dask) for regex in [True, False]: assert_eq(a.x.str.contains('a', regex=regex), df.x.str.contains('a', regex=regex)) assert set(a.x.str.contains('a', regex=regex).dask) == set(a.x.str.contains('a', regex=regex).dask) def test_empty_max(): meta = make_meta({'x': 'i8'}) a = dd.DataFrame({('x', 0): pd.DataFrame({'x': [1]}), ('x', 1): pd.DataFrame({'x': []})}, 'x', meta, [None, None, None]) assert_eq(a.x.max(), 1) def test_query(): df = pd.DataFrame({'x': [1, 2, 3, 4], 'y': [5, 6, 7, 8]}) a = dd.from_pandas(df, npartitions=2) q = a.query('x**2 > y') with ignoring(ImportError): assert_eq(q, df.query('x**2 > y')) def test_eval(): p = pd.DataFrame({'x': [1, 2, 3, 4], 'y': [5, 6, 7, 8]}) d = dd.from_pandas(p, npartitions=2) with ignoring(ImportError): assert_eq(p.eval('x + y'), d.eval('x + y')) assert_eq(p.eval('z = x + y', inplace=False), d.eval('z = x + y', inplace=False)) with pytest.raises(NotImplementedError): d.eval('z = x + y', inplace=True) # catch FutureWarning from pandas about assignment in eval with pytest.warns(None): if p.eval('z = x + y', inplace=None) is None: with pytest.raises(NotImplementedError): d.eval('z = x + y', inplace=None) @pytest.mark.parametrize('include, exclude', [ ([int], None), (None, [int]), ([np.number, object], [float]), (['datetime'], None) ]) def test_select_dtypes(include, exclude): n = 10 df = pd.DataFrame({'cint': [1] * n, 'cstr': ['a'] * n, 'clfoat': [1.] * n, 'cdt': pd.date_range('2016-01-01', periods=n)}) a = dd.from_pandas(df, npartitions=2) result = a.select_dtypes(include=include, exclude=exclude) expected = df.select_dtypes(include=include, exclude=exclude) assert_eq(result, expected) # count dtypes tm.assert_series_equal(a.get_dtype_counts(), df.get_dtype_counts()) tm.assert_series_equal(a.get_ftype_counts(), df.get_ftype_counts()) tm.assert_series_equal(result.get_dtype_counts(), expected.get_dtype_counts()) tm.assert_series_equal(result.get_ftype_counts(), expected.get_ftype_counts()) def test_deterministic_apply_concat_apply_names(): df = pd.DataFrame({'x': [1, 2, 3, 4], 'y': [5, 6, 7, 8]}) a = dd.from_pandas(df, npartitions=2) assert sorted(a.x.nlargest(2).dask) == sorted(a.x.nlargest(2).dask) assert sorted(a.x.nlargest(2).dask) != sorted(a.x.nlargest(3).dask) assert (sorted(a.x.drop_duplicates().dask) == sorted(a.x.drop_duplicates().dask)) assert (sorted(a.groupby('x').y.mean().dask) == sorted(a.groupby('x').y.mean().dask)) # Test aca without passing in token string f = lambda a: a.nlargest(5) f2 = lambda a: a.nlargest(3) assert (sorted(aca(a.x, f, f, a.x._meta).dask) != sorted(aca(a.x, f2, f2, a.x._meta).dask)) assert (sorted(aca(a.x, f, f, a.x._meta).dask) == sorted(aca(a.x, f, f, a.x._meta).dask)) # Test aca with keywords def chunk(x, c_key=0, both_key=0): return x.sum() + c_key + both_key def agg(x, a_key=0, both_key=0): return pd.Series(x).sum() + a_key + both_key c_key = 2 a_key = 3 both_key = 4 res = aca(a.x, chunk=chunk, aggregate=agg, chunk_kwargs={'c_key': c_key}, aggregate_kwargs={'a_key': a_key}, both_key=both_key) assert (sorted(res.dask) == sorted(aca(a.x, chunk=chunk, aggregate=agg, chunk_kwargs={'c_key': c_key}, aggregate_kwargs={'a_key': a_key}, both_key=both_key).dask)) assert (sorted(res.dask) != sorted(aca(a.x, chunk=chunk, aggregate=agg, chunk_kwargs={'c_key': c_key}, aggregate_kwargs={'a_key': a_key}, both_key=0).dask)) assert_eq(res, df.x.sum() + 2 * (c_key + both_key) + a_key + both_key) def test_aca_meta_infer(): df = pd.DataFrame({'x': [1, 2, 3, 4], 'y': [5, 6, 7, 8]}) ddf = dd.from_pandas(df, npartitions=2) def chunk(x, y, constant=1.0): return (x + y + constant).head() def agg(x): return x.head() res = aca([ddf, 2.0], chunk=chunk, aggregate=agg, chunk_kwargs=dict(constant=2.0)) sol = (df + 2.0 + 2.0).head() assert_eq(res, sol) # Should infer as a scalar res = aca([ddf.x], chunk=lambda x: pd.Series([x.sum()]), aggregate=lambda x: x.sum()) assert isinstance(res, Scalar) assert res.compute() == df.x.sum() def test_aca_split_every(): df = pd.DataFrame({'x': [1] * 60}) ddf = dd.from_pandas(df, npartitions=15) def chunk(x, y, constant=0): return x.sum() + y + constant def combine(x, constant=0): return x.sum() + constant + 1 def agg(x, constant=0): return x.sum() + constant + 2 f = lambda n: aca([ddf, 2.0], chunk=chunk, aggregate=agg, combine=combine, chunk_kwargs=dict(constant=1.0), combine_kwargs=dict(constant=2.0), aggregate_kwargs=dict(constant=3.0), split_every=n) assert_max_deps(f(3), 3) assert_max_deps(f(4), 4, False) assert_max_deps(f(5), 5) assert set(f(15).dask.keys()) == set(f(ddf.npartitions).dask.keys()) r3 = f(3) r4 = f(4) assert r3._name != r4._name # Only intersect on reading operations assert len(set(r3.dask.keys()) & set(r4.dask.keys())) == len(ddf.dask.keys()) # Keywords are different for each step assert f(3).compute() == 60 + 15 * (2 + 1) + 7 * (2 + 1) + (3 + 2) # Keywords are same for each step res = aca([ddf, 2.0], chunk=chunk, aggregate=agg, combine=combine, constant=3.0, split_every=3) assert res.compute() == 60 + 15 * (2 + 3) + 7 * (3 + 1) + (3 + 2) # No combine provided, combine is agg res = aca([ddf, 2.0], chunk=chunk, aggregate=agg, constant=3, split_every=3) assert res.compute() == 60 + 15 * (2 + 3) + 8 * (3 + 2) # split_every must be >= 2 with pytest.raises(ValueError): f(1) # combine_kwargs with no combine provided with pytest.raises(ValueError): aca([ddf, 2.0], chunk=chunk, aggregate=agg, split_every=3, chunk_kwargs=dict(constant=1.0), combine_kwargs=dict(constant=2.0), aggregate_kwargs=dict(constant=3.0)) def test_reduction_method(): df = pd.DataFrame({'x': range(50), 'y': range(50, 100)}) ddf = dd.from_pandas(df, npartitions=4) chunk = lambda x, val=0: (x >= val).sum() agg = lambda x: x.sum() # Output of chunk is a scalar res = ddf.x.reduction(chunk, aggregate=agg) assert_eq(res, df.x.count()) # Output of chunk is a series res = ddf.reduction(chunk, aggregate=agg) assert res._name == ddf.reduction(chunk, aggregate=agg)._name assert_eq(res, df.count()) # Test with keywords res2 = ddf.reduction(chunk, aggregate=agg, chunk_kwargs={'val': 25}) res2._name == ddf.reduction(chunk, aggregate=agg, chunk_kwargs={'val': 25})._name assert res2._name != res._name assert_eq(res2, (df >= 25).sum()) # Output of chunk is a dataframe def sum_and_count(x): return pd.DataFrame({'sum': x.sum(), 'count': x.count()}) res = ddf.reduction(sum_and_count, aggregate=lambda x: x.groupby(level=0).sum()) assert_eq(res, pd.DataFrame({'sum': df.sum(), 'count': df.count()})) def test_reduction_method_split_every(): df = pd.Series([1] * 60) ddf = dd.from_pandas(df, npartitions=15) def chunk(x, constant=0): return x.sum() + constant def combine(x, constant=0): return x.sum() + constant + 1 def agg(x, constant=0): return x.sum() + constant + 2 f = lambda n: ddf.reduction(chunk, aggregate=agg, combine=combine, chunk_kwargs=dict(constant=1.0), combine_kwargs=dict(constant=2.0), aggregate_kwargs=dict(constant=3.0), split_every=n) assert_max_deps(f(3), 3) assert_max_deps(f(4), 4, False) assert_max_deps(f(5), 5) assert set(f(15).dask.keys()) == set(f(ddf.npartitions).dask.keys()) r3 = f(3) r4 = f(4) assert r3._name != r4._name # Only intersect on reading operations assert len(set(r3.dask.keys()) & set(r4.dask.keys())) == len(ddf.dask.keys()) # Keywords are different for each step assert f(3).compute() == 60 + 15 + 7 * (2 + 1) + (3 + 2) # Keywords are same for each step res = ddf.reduction(chunk, aggregate=agg, combine=combine, constant=3.0, split_every=3) assert res.compute() == 60 + 15 * 3 + 7 * (3 + 1) + (3 + 2) # No combine provided, combine is agg res = ddf.reduction(chunk, aggregate=agg, constant=3.0, split_every=3) assert res.compute() == 60 + 15 * 3 + 8 * (3 + 2) # split_every must be >= 2 with pytest.raises(ValueError): f(1) # combine_kwargs with no combine provided with pytest.raises(ValueError): ddf.reduction(chunk, aggregate=agg, split_every=3, chunk_kwargs=dict(constant=1.0), combine_kwargs=dict(constant=2.0), aggregate_kwargs=dict(constant=3.0)) def test_pipe(): df = pd.DataFrame({'x': range(50), 'y': range(50, 100)}) ddf = dd.from_pandas(df, npartitions=4) def f(x, y, z=0): return x + y + z assert_eq(ddf.pipe(f, 1, z=2), f(ddf, 1, z=2)) assert_eq(ddf.x.pipe(f, 1, z=2), f(ddf.x, 1, z=2)) def test_gh_517(): arr = np.random.randn(100, 2) df = pd.DataFrame(arr, columns=['a', 'b']) ddf = dd.from_pandas(df, 2) assert ddf.index.nunique().compute() == 100 ddf2 = dd.from_pandas(pd.concat([df, df]), 5) assert ddf2.index.nunique().compute() == 100 def test_drop_axis_1(): df = pd.DataFrame({'x': [1, 2, 3, 4], 'y': [5, 6, 7, 8], 'z': [9, 10, 11, 12]}) ddf = dd.from_pandas(df, npartitions=2) assert_eq(ddf.drop('y', axis=1), df.drop('y', axis=1)) assert_eq(ddf.drop(['y', 'z'], axis=1), df.drop(['y', 'z'], axis=1)) with pytest.raises(ValueError): ddf.drop(['a', 'x'], axis=1) assert_eq(ddf.drop(['a', 'x'], axis=1, errors='ignore'), df.drop(['a', 'x'], axis=1, errors='ignore')) def test_gh580(): df = pd.DataFrame({'x': np.arange(10, dtype=float)}) ddf = dd.from_pandas(df, 2) assert_eq(np.cos(df['x']), np.cos(ddf['x'])) assert_eq(np.cos(df['x']), np.cos(ddf['x'])) def test_rename_dict(): renamer = {'a': 'A', 'b': 'B'} assert_eq(d.rename(columns=renamer), full.rename(columns=renamer)) def test_rename_function(): renamer = lambda x: x.upper() assert_eq(d.rename(columns=renamer), full.rename(columns=renamer)) def test_rename_index(): renamer = {0: 1} pytest.raises(ValueError, lambda: d.rename(index=renamer)) def test_to_timestamp(): index = pd.PeriodIndex(freq='A', start='1/1/2001', end='12/1/2004') df = pd.DataFrame({'x': [1, 2, 3, 4], 'y': [10, 20, 30, 40]}, index=index) ddf = dd.from_pandas(df, npartitions=3) assert_eq(ddf.to_timestamp(), df.to_timestamp()) assert_eq(ddf.to_timestamp(freq='M', how='s').compute(), df.to_timestamp(freq='M', how='s')) assert_eq(ddf.x.to_timestamp(), df.x.to_timestamp()) assert_eq(ddf.x.to_timestamp(freq='M', how='s').compute(), df.x.to_timestamp(freq='M', how='s')) def test_to_frame(): s = pd.Series([1, 2, 3], name='foo') a = dd.from_pandas(s, npartitions=2) assert_eq(s.to_frame(), a.to_frame()) assert_eq(s.to_frame('bar'), a.to_frame('bar')) def test_apply(): df = pd.DataFrame({'x': [1, 2, 3, 4], 'y': [10, 20, 30, 40]}) ddf = dd.from_pandas(df, npartitions=2) func = lambda row: row['x'] + row['y'] assert_eq(ddf.x.apply(lambda x: x + 1, meta=("x", int)), df.x.apply(lambda x: x + 1)) # specify meta assert_eq(ddf.apply(lambda xy: xy[0] + xy[1], axis=1, meta=(None, int)), df.apply(lambda xy: xy[0] + xy[1], axis=1)) assert_eq(ddf.apply(lambda xy: xy[0] + xy[1], axis='columns', meta=(None, int)), df.apply(lambda xy: xy[0] + xy[1], axis='columns')) # inference with pytest.warns(None): assert_eq(ddf.apply(lambda xy: xy[0] + xy[1], axis=1), df.apply(lambda xy: xy[0] + xy[1], axis=1)) with pytest.warns(None): assert_eq(ddf.apply(lambda xy: xy, axis=1), df.apply(lambda xy: xy, axis=1)) # specify meta func = lambda x: pd.Series([x, x]) assert_eq(ddf.x.apply(func, meta=[(0, int), (1, int)]), df.x.apply(func)) # inference with pytest.warns(None): assert_eq(ddf.x.apply(func), df.x.apply(func)) # axis=0 with pytest.raises(NotImplementedError): ddf.apply(lambda xy: xy, axis=0) with pytest.raises(NotImplementedError): ddf.apply(lambda xy: xy, axis='index') @pytest.mark.skipif(sys.version_info <= (3, 0), reason="Global filter is applied by another library, and " "not reset properly.") def test_apply_warns(): df = pd.DataFrame({'x': [1, 2, 3, 4], 'y': [10, 20, 30, 40]}) ddf = dd.from_pandas(df, npartitions=2) func = lambda row: row['x'] + row['y'] with pytest.warns(UserWarning) as w: ddf.apply(func, axis=1) assert len(w) == 1 with pytest.warns(None) as w: ddf.apply(func, axis=1, meta=(None, int)) assert len(w) == 0 def test_applymap(): df = pd.DataFrame({'x': [1, 2, 3, 4], 'y': [10, 20, 30, 40]}) ddf = dd.from_pandas(df, npartitions=2) assert_eq(ddf.applymap(lambda x: x + 1), df.applymap(lambda x: x + 1)) assert_eq(ddf.applymap(lambda x: (x, x)), df.applymap(lambda x: (x, x))) def test_abs(): df = pd.DataFrame({'A': [1, -2, 3, -4, 5], 'B': [-6., -7, -8, -9, 10], 'C': ['a', 'b', 'c', 'd', 'e']}) ddf = dd.from_pandas(df, npartitions=2) assert_eq(ddf.A.abs(), df.A.abs()) assert_eq(ddf[['A', 'B']].abs(), df[['A', 'B']].abs()) pytest.raises(ValueError, lambda: ddf.C.abs()) pytest.raises(TypeError, lambda: ddf.abs()) def test_round(): df = pd.DataFrame({'col1': [1.123, 2.123, 3.123], 'col2': [1.234, 2.234, 3.234]}) ddf = dd.from_pandas(df, npartitions=2) assert_eq(ddf.round(), df.round()) assert_eq(ddf.round(2), df.round(2)) def test_cov(): # DataFrame df = pd.util.testing.makeMissingDataframe(0.3, 42) ddf = dd.from_pandas(df, npartitions=6) res = ddf.cov() res2 = ddf.cov(split_every=2) res3 = ddf.cov(10) res4 = ddf.cov(10, split_every=2) sol = df.cov() sol2 = df.cov(10) assert_eq(res, sol) assert_eq(res2, sol) assert_eq(res3, sol2) assert_eq(res4, sol2) assert res._name == ddf.cov()._name assert res._name != res2._name assert res3._name != res4._name assert res._name != res3._name # Series a = df.A b = df.B da = dd.from_pandas(a, npartitions=6) db = dd.from_pandas(b, npartitions=7) res = da.cov(db) res2 = da.cov(db, split_every=2) res3 = da.cov(db, 10) res4 = da.cov(db, 10, split_every=2) sol = a.cov(b) sol2 = a.cov(b, 10) assert_eq(res, sol) assert_eq(res2, sol) assert_eq(res3, sol2) assert_eq(res4, sol2) assert res._name == da.cov(db)._name assert res._name != res2._name assert res3._name != res4._name assert res._name != res3._name def test_corr(): # DataFrame df = pd.util.testing.makeMissingDataframe(0.3, 42) ddf = dd.from_pandas(df, npartitions=6) res = ddf.corr() res2 = ddf.corr(split_every=2) res3 = ddf.corr(min_periods=10) res4 = ddf.corr(min_periods=10, split_every=2) sol = df.corr() sol2 = df.corr(min_periods=10) assert_eq(res, sol) assert_eq(res2, sol) assert_eq(res3, sol2) assert_eq(res4, sol2) assert res._name == ddf.corr()._name assert res._name != res2._name assert res3._name != res4._name assert res._name != res3._name pytest.raises(NotImplementedError, lambda: ddf.corr(method='spearman')) # Series a = df.A b = df.B da = dd.from_pandas(a, npartitions=6) db = dd.from_pandas(b, npartitions=7) res = da.corr(db) res2 = da.corr(db, split_every=2) res3 = da.corr(db, min_periods=10) res4 = da.corr(db, min_periods=10, split_every=2) sol = da.corr(db) sol2 = da.corr(db, min_periods=10) assert_eq(res, sol) assert_eq(res2, sol) assert_eq(res3, sol2) assert_eq(res4, sol2) assert res._name == da.corr(db)._name assert res._name != res2._name assert res3._name != res4._name assert res._name != res3._name pytest.raises(NotImplementedError, lambda: da.corr(db, method='spearman')) pytest.raises(TypeError, lambda: da.corr(ddf)) def test_cov_corr_meta(): df = pd.DataFrame({'a': np.array([1, 2, 3]), 'b': np.array([1.0, 2.0, 3.0], dtype='f4'), 'c': np.array([1.0, 2.0, 3.0])}, index=pd.Index([1, 2, 3], name='myindex')) ddf = dd.from_pandas(df, npartitions=2) assert_eq(ddf.corr(), df.corr()) assert_eq(ddf.cov(), df.cov()) assert ddf.a.cov(ddf.b)._meta.dtype == 'f8' assert ddf.a.corr(ddf.b)._meta.dtype == 'f8' @pytest.mark.slow def test_cov_corr_stable(): df = pd.DataFrame(np.random.random((20000000, 2)) * 2 - 1, columns=['a', 'b']) ddf = dd.from_pandas(df, npartitions=50) assert_eq(ddf.cov(split_every=8), df.cov()) assert_eq(ddf.corr(split_every=8), df.corr()) def test_autocorr(): x = pd.Series(np.random.random(100)) dx = dd.from_pandas(x, npartitions=10) assert_eq(dx.autocorr(2), x.autocorr(2)) assert_eq(dx.autocorr(0), x.autocorr(0)) assert_eq(dx.autocorr(-2), x.autocorr(-2)) assert_eq(dx.autocorr(2, split_every=3), x.autocorr(2)) pytest.raises(TypeError, lambda: dx.autocorr(1.5)) def test_apply_infer_columns(): df = pd.DataFrame({'x': [1, 2, 3, 4], 'y': [10, 20, 30, 40]}) ddf = dd.from_pandas(df, npartitions=2) def return_df(x): # will create new DataFrame which columns is ['sum', 'mean'] return pd.Series([x.sum(), x.mean()], index=['sum', 'mean']) # DataFrame to completely different DataFrame with pytest.warns(None): result = ddf.apply(return_df, axis=1) assert isinstance(result, dd.DataFrame) tm.assert_index_equal(result.columns, pd.Index(['sum', 'mean'])) assert_eq(result, df.apply(return_df, axis=1)) # DataFrame to Series with pytest.warns(None): result = ddf.apply(lambda x: 1, axis=1) assert isinstance(result, dd.Series) assert result.name is None assert_eq(result, df.apply(lambda x: 1, axis=1)) def return_df2(x): return pd.Series([x * 2, x * 3], index=['x2', 'x3']) # Series to completely different DataFrame with pytest.warns(None): result = ddf.x.apply(return_df2) assert isinstance(result, dd.DataFrame) tm.assert_index_equal(result.columns, pd.Index(['x2', 'x3'])) assert_eq(result, df.x.apply(return_df2)) # Series to Series with pytest.warns(None): result = ddf.x.apply(lambda x: 1) assert isinstance(result, dd.Series) assert result.name == 'x' assert_eq(result, df.x.apply(lambda x: 1)) def test_index_time_properties(): i = tm.makeTimeSeries() a = dd.from_pandas(i, npartitions=3) assert 'day' in dir(a.index) # returns a numpy array in pandas, but a Index in dask assert_eq(a.index.day, pd.Index(i.index.day)) assert_eq(a.index.month, pd.Index(i.index.month)) def test_nlargest_nsmallest(): from string import ascii_lowercase df = pd.DataFrame({'a': np.random.permutation(20), 'b': list(ascii_lowercase[:20]), 'c': np.random.permutation(20).astype('float64')}) ddf = dd.from_pandas(df, npartitions=3) for m in ['nlargest', 'nsmallest']: f = lambda df, *args, **kwargs: getattr(df, m)(*args, **kwargs) res = f(ddf, 5, 'a') res2 = f(ddf, 5, 'a', split_every=2) sol = f(df, 5, 'a') assert_eq(res, sol) assert_eq(res2, sol) assert res._name != res2._name res = f(ddf, 5, ['a', 'c']) res2 = f(ddf, 5, ['a', 'c'], split_every=2) sol = f(df, 5, ['a', 'c']) assert_eq(res, sol) assert_eq(res2, sol) assert res._name != res2._name res = f(ddf.a, 5) res2 = f(ddf.a, 5, split_every=2) sol = f(df.a, 5) assert_eq(res, sol) assert_eq(res2, sol) assert res._name != res2._name def test_reset_index(): df = pd.DataFrame({'x': [1, 2, 3, 4], 'y': [10, 20, 30, 40]}) ddf = dd.from_pandas(df, npartitions=2) sol = df.reset_index() res = ddf.reset_index() assert all(d is None for d in res.divisions) assert_eq(res, sol, check_index=False) sol = df.reset_index(drop=True) res = ddf.reset_index(drop=True) assert all(d is None for d in res.divisions) assert_eq(res, sol, check_index=False) sol = df.x.reset_index() res = ddf.x.reset_index() assert all(d is None for d in res.divisions) assert_eq(res, sol, check_index=False) sol = df.x.reset_index(drop=True) res = ddf.x.reset_index(drop=True) assert all(d is None for d in res.divisions) assert_eq(res, sol, check_index=False) def test_dataframe_compute_forward_kwargs(): x = dd.from_pandas(pd.DataFrame({'a': range(10)}), npartitions=2).a.sum() x.compute(bogus_keyword=10) def test_series_iteritems(): df = pd.DataFrame({'x': [1, 2, 3, 4]}) ddf = dd.from_pandas(df, npartitions=2) for (a, b) in zip(df['x'].iteritems(), ddf['x'].iteritems()): assert a == b def test_dataframe_iterrows(): df = pd.DataFrame({'x': [1, 2, 3, 4], 'y': [10, 20, 30, 40]}) ddf = dd.from_pandas(df, npartitions=2) for (a, b) in zip(df.iterrows(), ddf.iterrows()): tm.assert_series_equal(a[1], b[1]) def test_dataframe_itertuples(): df = pd.DataFrame({'x': [1, 2, 3, 4], 'y': [10, 20, 30, 40]}) ddf = dd.from_pandas(df, npartitions=2) for (a, b) in zip(df.itertuples(), ddf.itertuples()): assert a == b def test_astype(): df = pd.DataFrame({'x': [1, 2, 3, None], 'y': [10, 20, 30, 40]}, index=[10, 20, 30, 40]) a = dd.from_pandas(df, 2) assert_eq(a.astype(float), df.astype(float)) assert_eq(a.x.astype(float), df.x.astype(float)) def test_astype_categoricals(): df = pd.DataFrame({'x': ['a', 'b', 'c', 'b', 'c'], 'y': [1, 2, 3, 4, 5]}) ddf = dd.from_pandas(df, 2) ddf2 = ddf.astype({'x': 'category'}) assert not ddf2.x.cat.known assert ddf2.x.dtype == 'category' assert ddf2.compute().x.dtype == 'category' dx = ddf.x.astype('category') assert not dx.cat.known assert dx.dtype == 'category' assert dx.compute().dtype == 'category' def test_groupby_callable(): a = pd.DataFrame({'x': [1, 2, 3, None], 'y': [10, 20, 30, 40]}, index=[1, 2, 3, 4]) b = dd.from_pandas(a, 2) def iseven(x): return x % 2 == 0 assert_eq(a.groupby(iseven).y.sum(), b.groupby(iseven).y.sum()) assert_eq(a.y.groupby(iseven).sum(), b.y.groupby(iseven).sum()) def test_methods_tokenize_differently(): df = pd.DataFrame({'x': [1, 2, 3, 4]}) df = dd.from_pandas(df, npartitions=1) assert (df.x.map_partitions(lambda x: pd.Series(x.min()))._name != df.x.map_partitions(lambda x: pd.Series(x.max()))._name) def _assert_info(df, ddf, memory_usage=True): from io import StringIO assert isinstance(df, pd.DataFrame) assert isinstance(ddf, dd.DataFrame) buf_pd, buf_da = StringIO(), StringIO() df.info(buf=buf_pd, memory_usage=memory_usage) ddf.info(buf=buf_da, verbose=True, memory_usage=memory_usage) stdout_pd = buf_pd.getvalue() stdout_da = buf_da.getvalue() stdout_da = stdout_da.replace(str(type(ddf)), str(type(df))) assert stdout_pd == stdout_da def test_info(): from io import StringIO from dask.compatibility import unicode pandas_format._put_lines = put_lines test_frames = [ pd.DataFrame({'x': [1, 2, 3, 4], 'y': [1, 0, 1, 0]}, index=pd.Int64Index(range(4))), # No RangeIndex in dask pd.DataFrame() ] for df in test_frames: ddf = dd.from_pandas(df, npartitions=4) _assert_info(df, ddf) buf = StringIO() ddf = dd.from_pandas(pd.DataFrame({'x': [1, 2, 3, 4], 'y': [1, 0, 1, 0]}, index=range(4)), npartitions=4) # Verbose=False ddf.info(buf=buf, verbose=False) assert buf.getvalue() == unicode("\n" "Columns: 2 entries, x to y\n" "dtypes: int64(2)") # buf=None assert ddf.info(buf=None) is None def test_groupby_multilevel_info(): # GH 1844 from io import StringIO from dask.compatibility import unicode pandas_format._put_lines = put_lines df = pd.DataFrame({'A': [1, 1, 2, 2], 'B': [1, 2, 3, 4], 'C': [1, 2, 3, 4]}) ddf = dd.from_pandas(df, npartitions=2) g = ddf.groupby(['A', 'B']).sum() # slight difference between memory repr (single additional space) _assert_info(g.compute(), g, memory_usage=False) buf = StringIO() g.info(buf, verbose=False) assert buf.getvalue() == unicode(""" Columns: 1 entries, C to C dtypes: int64(1)""") # multilevel g = ddf.groupby(['A', 'B']).agg(['count', 'sum']) _assert_info(g.compute(), g, memory_usage=False) buf = StringIO() g.info(buf, verbose=False) assert buf.getvalue() == unicode(""" Columns: 2 entries, (C, count) to (C, sum) dtypes: int64(2)""") def test_categorize_info(): # assert that we can call info after categorize # workaround for: https://github.com/pydata/pandas/issues/14368 from io import StringIO from dask.compatibility import unicode pandas_format._put_lines = put_lines df = pd.DataFrame({'x': [1, 2, 3, 4], 'y': pd.Series(list('aabc')), 'z': pd.Series(list('aabc'))}, index=pd.Int64Index(range(4))) # No RangeIndex in dask ddf = dd.from_pandas(df, npartitions=4).categorize(['y']) # Verbose=False buf = StringIO() ddf.info(buf=buf, verbose=True) assert buf.getvalue() == unicode("\n" "Int64Index: 4 entries, 0 to 3\n" "Data columns (total 3 columns):\n" "x 4 non-null int64\n" "y 4 non-null category\n" "z 4 non-null object\n" "dtypes: category(1), object(1), int64(1)") def test_gh_1301(): df = pd.DataFrame([['1', '2'], ['3', '4']]) ddf = dd.from_pandas(df, npartitions=2) ddf2 = ddf.assign(y=ddf[1].astype(int)) assert_eq(ddf2, df.assign(y=df[1].astype(int))) assert ddf2.dtypes['y'] == np.dtype(int) def test_timeseries_sorted(): df = tm.makeTimeDataFrame() ddf = dd.from_pandas(df.reset_index(), npartitions=2) df.index.name = 'index' assert_eq(ddf.set_index('index', sorted=True, drop=True), df) def test_column_assignment(): df = pd.DataFrame({'x': [1, 2, 3, 4], 'y': [1, 0, 1, 0]}) ddf = dd.from_pandas(df, npartitions=2) orig = ddf.copy() ddf['z'] = ddf.x + ddf.y df['z'] = df.x + df.y assert_eq(df, ddf) assert 'z' not in orig.columns def test_columns_assignment(): df = pd.DataFrame({'x': [1, 2, 3, 4]}) ddf = dd.from_pandas(df, npartitions=2) df2 = df.assign(y=df.x + 1, z=df.x - 1) df[['a', 'b']] = df2[['y', 'z']] ddf2 = ddf.assign(y=ddf.x + 1, z=ddf.x - 1) ddf[['a', 'b']] = ddf2[['y', 'z']] assert_eq(df, ddf) def test_attribute_assignment(): df = pd.DataFrame({'x': [1, 2, 3, 4, 5], 'y': [1., 2., 3., 4., 5.]}) ddf = dd.from_pandas(df, npartitions=2) ddf.y = ddf.x + ddf.y assert_eq(ddf, df.assign(y=df.x + df.y)) def test_inplace_operators(): df = pd.DataFrame({'x': [1, 2, 3, 4, 5], 'y': [1., 2., 3., 4., 5.]}) ddf = dd.from_pandas(df, npartitions=2) ddf.y **= 0.5 assert_eq(ddf.y, df.y ** 0.5) assert_eq(ddf, df.assign(y=df.y ** 0.5)) @pytest.mark.parametrize("skipna", [True, False]) @pytest.mark.parametrize("idx", [ np.arange(100), sorted(np.random.random(size=100)), pd.date_range('20150101', periods=100) ]) def test_idxmaxmin(idx, skipna): df = pd.DataFrame(np.random.randn(100, 5), columns=list('abcde'), index=idx) df.b.iloc[31] = np.nan df.d.iloc[78] = np.nan ddf = dd.from_pandas(df, npartitions=3) assert_eq(df.idxmax(axis=1, skipna=skipna), ddf.idxmax(axis=1, skipna=skipna)) assert_eq(df.idxmin(axis=1, skipna=skipna), ddf.idxmin(axis=1, skipna=skipna)) assert_eq(df.idxmax(skipna=skipna), ddf.idxmax(skipna=skipna)) assert_eq(df.idxmax(skipna=skipna), ddf.idxmax(skipna=skipna, split_every=2)) assert (ddf.idxmax(skipna=skipna)._name != ddf.idxmax(skipna=skipna, split_every=2)._name) assert_eq(df.idxmin(skipna=skipna), ddf.idxmin(skipna=skipna)) assert_eq(df.idxmin(skipna=skipna), ddf.idxmin(skipna=skipna, split_every=2)) assert (ddf.idxmin(skipna=skipna)._name != ddf.idxmin(skipna=skipna, split_every=2)._name) assert_eq(df.a.idxmax(skipna=skipna), ddf.a.idxmax(skipna=skipna)) assert_eq(df.a.idxmax(skipna=skipna), ddf.a.idxmax(skipna=skipna, split_every=2)) assert (ddf.a.idxmax(skipna=skipna)._name != ddf.a.idxmax(skipna=skipna, split_every=2)._name) assert_eq(df.a.idxmin(skipna=skipna), ddf.a.idxmin(skipna=skipna)) assert_eq(df.a.idxmin(skipna=skipna), ddf.a.idxmin(skipna=skipna, split_every=2)) assert (ddf.a.idxmin(skipna=skipna)._name != ddf.a.idxmin(skipna=skipna, split_every=2)._name) def test_getitem_meta(): data = {'col1': ['a', 'a', 'b'], 'col2': [0, 1, 0]} df = pd.DataFrame(data=data, columns=['col1', 'col2']) ddf = dd.from_pandas(df, npartitions=1) assert_eq(df.col2[df.col1 == 'a'], ddf.col2[ddf.col1 == 'a']) def test_getitem_multilevel(): pdf = pd.DataFrame({('A', '0') : [1,2,2], ('B', '1') : [1,2,3]}) ddf = dd.from_pandas(pdf, npartitions=3) assert_eq(pdf['A', '0'], ddf['A', '0']) assert_eq(pdf[[('A', '0'), ('B', '1')]], ddf[[('A', '0'), ('B', '1')]]) def test_diff(): df = pd.DataFrame(np.random.randn(100, 5), columns=list('abcde')) ddf = dd.from_pandas(df, 5) assert_eq(ddf.diff(), df.diff()) assert_eq(ddf.diff(0), df.diff(0)) assert_eq(ddf.diff(2), df.diff(2)) assert_eq(ddf.diff(-2), df.diff(-2)) assert_eq(ddf.diff(2, axis=1), df.diff(2, axis=1)) assert_eq(ddf.a.diff(), df.a.diff()) assert_eq(ddf.a.diff(0), df.a.diff(0)) assert_eq(ddf.a.diff(2), df.a.diff(2)) assert_eq(ddf.a.diff(-2), df.a.diff(-2)) assert ddf.diff(2)._name == ddf.diff(2)._name assert ddf.diff(2)._name != ddf.diff(3)._name pytest.raises(TypeError, lambda: ddf.diff(1.5)) def test_shift(): df = tm.makeTimeDataFrame() ddf = dd.from_pandas(df, npartitions=4) # DataFrame assert_eq(ddf.shift(), df.shift()) assert_eq(ddf.shift(0), df.shift(0)) assert_eq(ddf.shift(2), df.shift(2)) assert_eq(ddf.shift(-2), df.shift(-2)) assert_eq(ddf.shift(2, axis=1), df.shift(2, axis=1)) # Series assert_eq(ddf.A.shift(), df.A.shift()) assert_eq(ddf.A.shift(0), df.A.shift(0)) assert_eq(ddf.A.shift(2), df.A.shift(2)) assert_eq(ddf.A.shift(-2), df.A.shift(-2)) with pytest.raises(TypeError): ddf.shift(1.5) def test_shift_with_freq(): df = tm.makeTimeDataFrame(30) # DatetimeIndex for data_freq, divs1 in [('B', False), ('D', True), ('H', True)]: df = df.set_index(tm.makeDateIndex(30, freq=data_freq)) ddf = dd.from_pandas(df, npartitions=4) for freq, divs2 in [('S', True), ('W', False), (pd.Timedelta(10, unit='h'), True)]: for d, p in [(ddf, df), (ddf.A, df.A), (ddf.index, df.index)]: res = d.shift(2, freq=freq) assert_eq(res, p.shift(2, freq=freq)) assert res.known_divisions == divs2 # Index shifts also work with freq=None res = ddf.index.shift(2) assert_eq(res, df.index.shift(2)) assert res.known_divisions == divs1 # PeriodIndex for data_freq, divs in [('B', False), ('D', True), ('H', True)]: df = df.set_index(pd.period_range('2000-01-01', periods=30, freq=data_freq)) ddf = dd.from_pandas(df, npartitions=4) for d, p in [(ddf, df), (ddf.A, df.A)]: res = d.shift(2, freq=data_freq) assert_eq(res, p.shift(2, freq=data_freq)) assert res.known_divisions == divs # PeriodIndex.shift doesn't have `freq` parameter res = ddf.index.shift(2) assert_eq(res, df.index.shift(2)) assert res.known_divisions == divs with pytest.raises(ValueError): ddf.index.shift(2, freq='D') # freq keyword not supported # TimedeltaIndex for data_freq in ['T', 'D', 'H']: df = df.set_index(tm.makeTimedeltaIndex(30, freq=data_freq)) ddf = dd.from_pandas(df, npartitions=4) for freq in ['S', pd.Timedelta(10, unit='h')]: for d, p in [(ddf, df), (ddf.A, df.A), (ddf.index, df.index)]: res = d.shift(2, freq=freq) assert_eq(res, p.shift(2, freq=freq)) assert res.known_divisions # Index shifts also work with freq=None res = ddf.index.shift(2) assert_eq(res, df.index.shift(2)) assert res.known_divisions # Other index types error df = tm.makeDataFrame() ddf = dd.from_pandas(df, npartitions=4) pytest.raises(NotImplementedError, lambda: ddf.shift(2, freq='S')) pytest.raises(NotImplementedError, lambda: ddf.A.shift(2, freq='S')) pytest.raises(NotImplementedError, lambda: ddf.index.shift(2)) @pytest.mark.parametrize('method', ['first', 'last']) def test_first_and_last(method): f = lambda x, offset: getattr(x, method)(offset) freqs = ['12h', 'D'] offsets = ['0d', '100h', '20d', '20B', '3W', '3M', '400d', '13M'] for freq in freqs: index = pd.date_range('1/1/2000', '1/1/2001', freq=freq)[::4] df = pd.DataFrame(np.random.random((len(index), 4)), index=index, columns=['A', 'B', 'C', 'D']) ddf = dd.from_pandas(df, npartitions=10) for offset in offsets: assert_eq(f(ddf, offset), f(df, offset)) assert_eq(f(ddf.A, offset), f(df.A, offset)) @pytest.mark.parametrize('npartitions', [1, 4, 20]) @pytest.mark.parametrize('split_every', [2, 5]) @pytest.mark.parametrize('split_out', [None, 1, 5, 20]) def test_hash_split_unique(npartitions, split_every, split_out): from string import ascii_lowercase s = pd.Series(np.random.choice(list(ascii_lowercase), 1000, replace=True)) ds = dd.from_pandas(s, npartitions=npartitions) dropped = ds.unique(split_every=split_every, split_out=split_out) dsk = dropped._optimize(dropped.dask, dropped._keys()) from dask.core import get_deps dependencies, dependents = get_deps(dsk) assert len([k for k, v in dependencies.items() if not v]) == npartitions assert dropped.npartitions == (split_out or 1) assert sorted(dropped.compute(get=dask.get)) == sorted(s.unique()) @pytest.mark.parametrize('split_every', [None, 2]) def test_split_out_drop_duplicates(split_every): x = np.concatenate([np.arange(10)] * 100)[:, None] y = x.copy() z = np.concatenate([np.arange(20)] * 50)[:, None] rs = np.random.RandomState(1) rs.shuffle(x) rs.shuffle(y) rs.shuffle(z) df = pd.DataFrame(np.concatenate([x, y, z], axis=1), columns=['x', 'y', 'z']) ddf = dd.from_pandas(df, npartitions=20) for subset, keep in product([None, ['x', 'z']], ['first', 'last']): sol = df.drop_duplicates(subset=subset, keep=keep) res = ddf.drop_duplicates(subset=subset, keep=keep, split_every=split_every, split_out=10) assert res.npartitions == 10 assert_eq(sol, res) @pytest.mark.parametrize('split_every', [None, 2]) def test_split_out_value_counts(split_every): df = pd.DataFrame({'x': [1, 2, 3] * 100}) ddf = dd.from_pandas(df, npartitions=5) assert ddf.x.value_counts(split_out=10, split_every=split_every).npartitions == 10 assert_eq(ddf.x.value_counts(split_out=10, split_every=split_every), df.x.value_counts()) def test_values(): from dask.array.utils import assert_eq df = pd.DataFrame({'x': ['a', 'b', 'c', 'd'], 'y': [2, 3, 4, 5]}, index=pd.Index([1., 2., 3., 4.], name='ind')) ddf = dd.from_pandas(df, 2) assert_eq(df.values, ddf.values) assert_eq(df.x.values, ddf.x.values) assert_eq(df.y.values, ddf.y.values) assert_eq(df.index.values, ddf.index.values) def test_copy(): df = pd.DataFrame({'x': [1, 2, 3]}) a = dd.from_pandas(df, npartitions=2) b = a.copy() a['y'] = a.x * 2 assert_eq(b, df) df['y'] = df.x * 2 def test_del(): df = pd.DataFrame({'x': ['a', 'b', 'c', 'd'], 'y': [2, 3, 4, 5]}, index=pd.Index([1., 2., 3., 4.], name='ind')) a = dd.from_pandas(df, 2) b = a.copy() del a['x'] assert_eq(b, df) del df['x'] assert_eq(a, df) @pytest.mark.parametrize('index', [True, False]) @pytest.mark.parametrize('deep', [True, False]) def test_memory_usage(index, deep): df = pd.DataFrame({'x': [1, 2, 3], 'y': [1.0, 2.0, 3.0], 'z': ['a', 'b', 'c']}) ddf = dd.from_pandas(df, npartitions=2) assert_eq(df.memory_usage(index=index, deep=deep), ddf.memory_usage(index=index, deep=deep)) assert (df.x.memory_usage(index=index, deep=deep) == ddf.x.memory_usage(index=index, deep=deep).compute()) @pytest.mark.parametrize('reduction', ['sum', 'mean', 'std', 'var', 'count', 'min', 'max', 'idxmin', 'idxmax', 'prod', 'all', 'sem']) def test_dataframe_reductions_arithmetic(reduction): df = pd.DataFrame({'x': [1, 2, 3, 4, 5], 'y': [1.1, 2.2, 3.3, 4.4, 5.5]}) ddf = dd.from_pandas(df, npartitions=3) assert_eq(ddf - (getattr(ddf, reduction)() + 1), df - (getattr(df, reduction)() + 1)) def test_datetime_loc_open_slicing(): dtRange = pd.date_range('01.01.2015','05.05.2015') df = pd.DataFrame(np.random.random((len(dtRange), 2)), index=dtRange) ddf = dd.from_pandas(df, npartitions=5) assert_eq(df.loc[:'02.02.2015'], ddf.loc[:'02.02.2015']) assert_eq(df.loc['02.02.2015':], ddf.loc['02.02.2015':]) assert_eq(df[0].loc[:'02.02.2015'], ddf[0].loc[:'02.02.2015']) assert_eq(df[0].loc['02.02.2015':], ddf[0].loc['02.02.2015':]) def test_to_datetime(): df = pd.DataFrame({'year': [2015, 2016], 'month': [2, 3], 'day': [4, 5]}) ddf = dd.from_pandas(df, npartitions=2) assert_eq(pd.to_datetime(df), dd.to_datetime(ddf)) s = pd.Series(['3/11/2000', '3/12/2000', '3/13/2000'] * 100) ds = dd.from_pandas(s, npartitions=10) assert_eq(pd.to_datetime(s, infer_datetime_format=True), dd.to_datetime(ds, infer_datetime_format=True)) @pytest.mark.parametrize('drop', [0, 9]) def test_slice_on_filtered_boundary(drop): # https://github.com/dask/dask/issues/2211 x = np.arange(10) x[[5, 6]] -= 2 df = pd.DataFrame({"A": x, "B": np.arange(len(x))}) pdf = df.set_index("A").query("B != {}".format(drop)) ddf = dd.from_pandas(df, 1).set_index("A").query("B != {}".format(drop)) result = dd.concat([ddf, ddf.rename(columns={"B": "C"})], axis=1) expected = pd.concat([pdf, pdf.rename(columns={"B": "C"})], axis=1) assert_eq(result, expected) def test_boundary_slice_nonmonotonic(): x = np.array([-1, -2, 2, 4, 3]) df = pd.DataFrame({"B": range(len(x))}, index=x) result = boundary_slice(df, 0, 4) expected = df.iloc[2:] tm.assert_frame_equal(result, expected) result = boundary_slice(df, -1, 4) expected = df.drop(-2) tm.assert_frame_equal(result, expected) result = boundary_slice(df, -2, 3) expected = df.drop(4) tm.assert_frame_equal(result, expected) result = boundary_slice(df, -2, 3.5) expected = df.drop(4) tm.assert_frame_equal(result, expected) result = boundary_slice(df, -2, 4) expected = df tm.assert_frame_equal(result, expected) @pytest.mark.parametrize('start, stop, right_boundary, left_boundary, drop', [ (-1, None, False, False, [-1, -2]), (-1, None, False, True, [-2]), (None, 3, False, False, [3, 4]), (None, 3, True, False, [4]), # Missing keys (-.5, None, False, False, [-1, -2]), (-.5, None, False, True, [-1, -2]), (-1.5, None, False, True, [-2]), (None, 3.5, False, False, [4]), (None, 3.5, True, False, [4]), (None, 2.5, False, False, [3, 4]), ]) def test_with_boundary(start, stop, right_boundary, left_boundary, drop): x = np.array([-1, -2, 2, 4, 3]) df = pd.DataFrame({"B": range(len(x))}, index=x) result = boundary_slice(df, start, stop, right_boundary, left_boundary) expected = df.drop(drop) tm.assert_frame_equal(result, expected) @pytest.mark.parametrize('index, left, right', [ (range(10), 0, 9), (range(10), -1, None), (range(10), None, 10), ([-1, 0, 2, 1], None, None), ([-1, 0, 2, 1], -1, None), ([-1, 0, 2, 1], None, 2), ([-1, 0, 2, 1], -2, 3), (pd.date_range("2017", periods=10), None, None), (pd.date_range("2017", periods=10), pd.Timestamp("2017"), None), (pd.date_range("2017", periods=10), None, pd.Timestamp("2017-01-10")), (pd.date_range("2017", periods=10), pd.Timestamp("2016"), None), (pd.date_range("2017", periods=10), None, pd.Timestamp("2018")), ]) def test_boundary_slice_same(index, left, right): df = pd.DataFrame({"A": range(len(index))}, index=index) result = boundary_slice(df, left, right) tm.assert_frame_equal(result, df) def test_better_errors_object_reductions(): # GH2452 s = pd.Series(['a', 'b', 'c', 'd']) ds = dd.from_pandas(s, npartitions=2) with pytest.raises(ValueError) as err: ds.mean() assert str(err.value) == "`mean` not supported with object series"