813 lines
31 KiB
Python
813 lines
31 KiB
Python
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# pylint: disable=E1103
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from warnings import catch_warnings
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from numpy.random import randn
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import numpy as np
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import pytest
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import pandas as pd
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from pandas.compat import lrange
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import pandas.compat as compat
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from pandas.util.testing import assert_frame_equal
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from pandas import DataFrame, MultiIndex, Series, Index, merge, concat
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from pandas._libs import join as libjoin
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import pandas.util.testing as tm
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from pandas.tests.reshape.merge.test_merge import get_test_data, N, NGROUPS
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a_ = np.array
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class TestJoin(object):
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def setup_method(self, method):
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# aggregate multiple columns
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self.df = DataFrame({'key1': get_test_data(),
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'key2': get_test_data(),
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'data1': np.random.randn(N),
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'data2': np.random.randn(N)})
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# exclude a couple keys for fun
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self.df = self.df[self.df['key2'] > 1]
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self.df2 = DataFrame({'key1': get_test_data(n=N // 5),
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'key2': get_test_data(ngroups=NGROUPS // 2,
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n=N // 5),
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'value': np.random.randn(N // 5)})
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index, data = tm.getMixedTypeDict()
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self.target = DataFrame(data, index=index)
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# Join on string value
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self.source = DataFrame({'MergedA': data['A'], 'MergedD': data['D']},
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index=data['C'])
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def test_cython_left_outer_join(self):
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left = a_([0, 1, 2, 1, 2, 0, 0, 1, 2, 3, 3], dtype=np.int64)
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right = a_([1, 1, 0, 4, 2, 2, 1], dtype=np.int64)
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max_group = 5
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ls, rs = libjoin.left_outer_join(left, right, max_group)
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exp_ls = left.argsort(kind='mergesort')
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exp_rs = right.argsort(kind='mergesort')
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exp_li = a_([0, 1, 2, 3, 3, 3, 4, 4, 4, 5, 5, 5,
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6, 6, 7, 7, 8, 8, 9, 10])
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exp_ri = a_([0, 0, 0, 1, 2, 3, 1, 2, 3, 1, 2, 3,
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4, 5, 4, 5, 4, 5, -1, -1])
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exp_ls = exp_ls.take(exp_li)
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exp_ls[exp_li == -1] = -1
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exp_rs = exp_rs.take(exp_ri)
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exp_rs[exp_ri == -1] = -1
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tm.assert_numpy_array_equal(ls, exp_ls, check_dtype=False)
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tm.assert_numpy_array_equal(rs, exp_rs, check_dtype=False)
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def test_cython_right_outer_join(self):
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left = a_([0, 1, 2, 1, 2, 0, 0, 1, 2, 3, 3], dtype=np.int64)
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right = a_([1, 1, 0, 4, 2, 2, 1], dtype=np.int64)
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max_group = 5
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rs, ls = libjoin.left_outer_join(right, left, max_group)
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exp_ls = left.argsort(kind='mergesort')
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exp_rs = right.argsort(kind='mergesort')
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# 0 1 1 1
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exp_li = a_([0, 1, 2, 3, 4, 5, 3, 4, 5, 3, 4, 5,
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# 2 2 4
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6, 7, 8, 6, 7, 8, -1])
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exp_ri = a_([0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3,
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4, 4, 4, 5, 5, 5, 6])
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exp_ls = exp_ls.take(exp_li)
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exp_ls[exp_li == -1] = -1
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exp_rs = exp_rs.take(exp_ri)
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exp_rs[exp_ri == -1] = -1
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tm.assert_numpy_array_equal(ls, exp_ls, check_dtype=False)
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tm.assert_numpy_array_equal(rs, exp_rs, check_dtype=False)
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def test_cython_inner_join(self):
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left = a_([0, 1, 2, 1, 2, 0, 0, 1, 2, 3, 3], dtype=np.int64)
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right = a_([1, 1, 0, 4, 2, 2, 1, 4], dtype=np.int64)
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max_group = 5
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ls, rs = libjoin.inner_join(left, right, max_group)
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exp_ls = left.argsort(kind='mergesort')
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exp_rs = right.argsort(kind='mergesort')
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exp_li = a_([0, 1, 2, 3, 3, 3, 4, 4, 4, 5, 5, 5,
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6, 6, 7, 7, 8, 8])
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exp_ri = a_([0, 0, 0, 1, 2, 3, 1, 2, 3, 1, 2, 3,
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4, 5, 4, 5, 4, 5])
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exp_ls = exp_ls.take(exp_li)
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exp_ls[exp_li == -1] = -1
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exp_rs = exp_rs.take(exp_ri)
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exp_rs[exp_ri == -1] = -1
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tm.assert_numpy_array_equal(ls, exp_ls, check_dtype=False)
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tm.assert_numpy_array_equal(rs, exp_rs, check_dtype=False)
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def test_left_outer_join(self):
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joined_key2 = merge(self.df, self.df2, on='key2')
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_check_join(self.df, self.df2, joined_key2, ['key2'], how='left')
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joined_both = merge(self.df, self.df2)
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_check_join(self.df, self.df2, joined_both, ['key1', 'key2'],
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how='left')
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def test_right_outer_join(self):
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joined_key2 = merge(self.df, self.df2, on='key2', how='right')
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_check_join(self.df, self.df2, joined_key2, ['key2'], how='right')
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joined_both = merge(self.df, self.df2, how='right')
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_check_join(self.df, self.df2, joined_both, ['key1', 'key2'],
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how='right')
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def test_full_outer_join(self):
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joined_key2 = merge(self.df, self.df2, on='key2', how='outer')
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_check_join(self.df, self.df2, joined_key2, ['key2'], how='outer')
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joined_both = merge(self.df, self.df2, how='outer')
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_check_join(self.df, self.df2, joined_both, ['key1', 'key2'],
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how='outer')
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def test_inner_join(self):
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joined_key2 = merge(self.df, self.df2, on='key2', how='inner')
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_check_join(self.df, self.df2, joined_key2, ['key2'], how='inner')
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joined_both = merge(self.df, self.df2, how='inner')
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_check_join(self.df, self.df2, joined_both, ['key1', 'key2'],
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how='inner')
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def test_handle_overlap(self):
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joined = merge(self.df, self.df2, on='key2',
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suffixes=['.foo', '.bar'])
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assert 'key1.foo' in joined
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assert 'key1.bar' in joined
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def test_handle_overlap_arbitrary_key(self):
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joined = merge(self.df, self.df2,
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left_on='key2', right_on='key1',
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suffixes=['.foo', '.bar'])
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assert 'key1.foo' in joined
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assert 'key2.bar' in joined
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def test_join_on(self):
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target = self.target
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source = self.source
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merged = target.join(source, on='C')
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tm.assert_series_equal(merged['MergedA'], target['A'],
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check_names=False)
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tm.assert_series_equal(merged['MergedD'], target['D'],
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check_names=False)
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# join with duplicates (fix regression from DataFrame/Matrix merge)
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df = DataFrame({'key': ['a', 'a', 'b', 'b', 'c']})
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df2 = DataFrame({'value': [0, 1, 2]}, index=['a', 'b', 'c'])
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joined = df.join(df2, on='key')
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expected = DataFrame({'key': ['a', 'a', 'b', 'b', 'c'],
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'value': [0, 0, 1, 1, 2]})
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assert_frame_equal(joined, expected)
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# Test when some are missing
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df_a = DataFrame([[1], [2], [3]], index=['a', 'b', 'c'],
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columns=['one'])
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df_b = DataFrame([['foo'], ['bar']], index=[1, 2],
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columns=['two'])
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df_c = DataFrame([[1], [2]], index=[1, 2],
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columns=['three'])
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joined = df_a.join(df_b, on='one')
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joined = joined.join(df_c, on='one')
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assert np.isnan(joined['two']['c'])
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assert np.isnan(joined['three']['c'])
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# merge column not p resent
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pytest.raises(KeyError, target.join, source, on='E')
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# overlap
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source_copy = source.copy()
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source_copy['A'] = 0
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pytest.raises(ValueError, target.join, source_copy, on='A')
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def test_join_on_fails_with_different_right_index(self):
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with pytest.raises(ValueError):
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df = DataFrame({'a': np.random.choice(['m', 'f'], size=3),
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'b': np.random.randn(3)})
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df2 = DataFrame({'a': np.random.choice(['m', 'f'], size=10),
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'b': np.random.randn(10)},
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index=tm.makeCustomIndex(10, 2))
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merge(df, df2, left_on='a', right_index=True)
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def test_join_on_fails_with_different_left_index(self):
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with pytest.raises(ValueError):
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df = DataFrame({'a': np.random.choice(['m', 'f'], size=3),
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'b': np.random.randn(3)},
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index=tm.makeCustomIndex(10, 2))
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df2 = DataFrame({'a': np.random.choice(['m', 'f'], size=10),
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'b': np.random.randn(10)})
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merge(df, df2, right_on='b', left_index=True)
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def test_join_on_fails_with_different_column_counts(self):
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with pytest.raises(ValueError):
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df = DataFrame({'a': np.random.choice(['m', 'f'], size=3),
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'b': np.random.randn(3)})
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df2 = DataFrame({'a': np.random.choice(['m', 'f'], size=10),
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'b': np.random.randn(10)},
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index=tm.makeCustomIndex(10, 2))
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merge(df, df2, right_on='a', left_on=['a', 'b'])
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def test_join_on_fails_with_wrong_object_type(self):
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# GH12081
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wrongly_typed = [Series([0, 1]), 2, 'str', None, np.array([0, 1])]
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df = DataFrame({'a': [1, 1]})
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for obj in wrongly_typed:
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with tm.assert_raises_regex(ValueError, str(type(obj))):
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merge(obj, df, left_on='a', right_on='a')
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with tm.assert_raises_regex(ValueError, str(type(obj))):
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merge(df, obj, left_on='a', right_on='a')
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def test_join_on_pass_vector(self):
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expected = self.target.join(self.source, on='C')
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del expected['C']
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join_col = self.target.pop('C')
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result = self.target.join(self.source, on=join_col)
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assert_frame_equal(result, expected)
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def test_join_with_len0(self):
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# nothing to merge
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merged = self.target.join(self.source.reindex([]), on='C')
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for col in self.source:
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assert col in merged
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assert merged[col].isna().all()
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merged2 = self.target.join(self.source.reindex([]), on='C',
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how='inner')
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tm.assert_index_equal(merged2.columns, merged.columns)
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assert len(merged2) == 0
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def test_join_on_inner(self):
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df = DataFrame({'key': ['a', 'a', 'd', 'b', 'b', 'c']})
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df2 = DataFrame({'value': [0, 1]}, index=['a', 'b'])
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joined = df.join(df2, on='key', how='inner')
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expected = df.join(df2, on='key')
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expected = expected[expected['value'].notna()]
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tm.assert_series_equal(joined['key'], expected['key'],
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check_dtype=False)
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tm.assert_series_equal(joined['value'], expected['value'],
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check_dtype=False)
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tm.assert_index_equal(joined.index, expected.index)
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def test_join_on_singlekey_list(self):
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df = DataFrame({'key': ['a', 'a', 'b', 'b', 'c']})
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df2 = DataFrame({'value': [0, 1, 2]}, index=['a', 'b', 'c'])
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# corner cases
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joined = df.join(df2, on=['key'])
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expected = df.join(df2, on='key')
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assert_frame_equal(joined, expected)
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def test_join_on_series(self):
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result = self.target.join(self.source['MergedA'], on='C')
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expected = self.target.join(self.source[['MergedA']], on='C')
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assert_frame_equal(result, expected)
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def test_join_on_series_buglet(self):
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# GH #638
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df = DataFrame({'a': [1, 1]})
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ds = Series([2], index=[1], name='b')
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result = df.join(ds, on='a')
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expected = DataFrame({'a': [1, 1],
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'b': [2, 2]}, index=df.index)
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tm.assert_frame_equal(result, expected)
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def test_join_index_mixed(self, join_type):
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# no overlapping blocks
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df1 = DataFrame(index=np.arange(10))
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df1['bool'] = True
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df1['string'] = 'foo'
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df2 = DataFrame(index=np.arange(5, 15))
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df2['int'] = 1
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df2['float'] = 1.
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joined = df1.join(df2, how=join_type)
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expected = _join_by_hand(df1, df2, how=join_type)
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assert_frame_equal(joined, expected)
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joined = df2.join(df1, how=join_type)
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expected = _join_by_hand(df2, df1, how=join_type)
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assert_frame_equal(joined, expected)
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def test_join_index_mixed_overlap(self):
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df1 = DataFrame({'A': 1., 'B': 2, 'C': 'foo', 'D': True},
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index=np.arange(10),
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columns=['A', 'B', 'C', 'D'])
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assert df1['B'].dtype == np.int64
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assert df1['D'].dtype == np.bool_
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|
|
df2 = DataFrame({'A': 1., 'B': 2, 'C': 'foo', 'D': True},
|
||
|
|
index=np.arange(0, 10, 2),
|
||
|
|
columns=['A', 'B', 'C', 'D'])
|
||
|
|
|
||
|
|
# overlap
|
||
|
|
joined = df1.join(df2, lsuffix='_one', rsuffix='_two')
|
||
|
|
expected_columns = ['A_one', 'B_one', 'C_one', 'D_one',
|
||
|
|
'A_two', 'B_two', 'C_two', 'D_two']
|
||
|
|
df1.columns = expected_columns[:4]
|
||
|
|
df2.columns = expected_columns[4:]
|
||
|
|
expected = _join_by_hand(df1, df2)
|
||
|
|
assert_frame_equal(joined, expected)
|
||
|
|
|
||
|
|
def test_join_empty_bug(self):
|
||
|
|
# generated an exception in 0.4.3
|
||
|
|
x = DataFrame()
|
||
|
|
x.join(DataFrame([3], index=[0], columns=['A']), how='outer')
|
||
|
|
|
||
|
|
def test_join_unconsolidated(self):
|
||
|
|
# GH #331
|
||
|
|
a = DataFrame(randn(30, 2), columns=['a', 'b'])
|
||
|
|
c = Series(randn(30))
|
||
|
|
a['c'] = c
|
||
|
|
d = DataFrame(randn(30, 1), columns=['q'])
|
||
|
|
|
||
|
|
# it works!
|
||
|
|
a.join(d)
|
||
|
|
d.join(a)
|
||
|
|
|
||
|
|
def test_join_multiindex(self):
|
||
|
|
index1 = MultiIndex.from_arrays([['a', 'a', 'a', 'b', 'b', 'b'],
|
||
|
|
[1, 2, 3, 1, 2, 3]],
|
||
|
|
names=['first', 'second'])
|
||
|
|
|
||
|
|
index2 = MultiIndex.from_arrays([['b', 'b', 'b', 'c', 'c', 'c'],
|
||
|
|
[1, 2, 3, 1, 2, 3]],
|
||
|
|
names=['first', 'second'])
|
||
|
|
|
||
|
|
df1 = DataFrame(data=np.random.randn(6), index=index1,
|
||
|
|
columns=['var X'])
|
||
|
|
df2 = DataFrame(data=np.random.randn(6), index=index2,
|
||
|
|
columns=['var Y'])
|
||
|
|
|
||
|
|
df1 = df1.sort_index(level=0)
|
||
|
|
df2 = df2.sort_index(level=0)
|
||
|
|
|
||
|
|
joined = df1.join(df2, how='outer')
|
||
|
|
ex_index = Index(index1.values).union(Index(index2.values))
|
||
|
|
expected = df1.reindex(ex_index).join(df2.reindex(ex_index))
|
||
|
|
expected.index.names = index1.names
|
||
|
|
assert_frame_equal(joined, expected)
|
||
|
|
assert joined.index.names == index1.names
|
||
|
|
|
||
|
|
df1 = df1.sort_index(level=1)
|
||
|
|
df2 = df2.sort_index(level=1)
|
||
|
|
|
||
|
|
joined = df1.join(df2, how='outer').sort_index(level=0)
|
||
|
|
ex_index = Index(index1.values).union(Index(index2.values))
|
||
|
|
expected = df1.reindex(ex_index).join(df2.reindex(ex_index))
|
||
|
|
expected.index.names = index1.names
|
||
|
|
|
||
|
|
assert_frame_equal(joined, expected)
|
||
|
|
assert joined.index.names == index1.names
|
||
|
|
|
||
|
|
def test_join_inner_multiindex(self):
|
||
|
|
key1 = ['bar', 'bar', 'bar', 'foo', 'foo', 'baz', 'baz', 'qux',
|
||
|
|
'qux', 'snap']
|
||
|
|
key2 = ['two', 'one', 'three', 'one', 'two', 'one', 'two', 'two',
|
||
|
|
'three', 'one']
|
||
|
|
|
||
|
|
data = np.random.randn(len(key1))
|
||
|
|
data = DataFrame({'key1': key1, 'key2': key2,
|
||
|
|
'data': data})
|
||
|
|
|
||
|
|
index = MultiIndex(levels=[['foo', 'bar', 'baz', 'qux'],
|
||
|
|
['one', 'two', 'three']],
|
||
|
|
labels=[[0, 0, 0, 1, 1, 2, 2, 3, 3, 3],
|
||
|
|
[0, 1, 2, 0, 1, 1, 2, 0, 1, 2]],
|
||
|
|
names=['first', 'second'])
|
||
|
|
to_join = DataFrame(np.random.randn(10, 3), index=index,
|
||
|
|
columns=['j_one', 'j_two', 'j_three'])
|
||
|
|
|
||
|
|
joined = data.join(to_join, on=['key1', 'key2'], how='inner')
|
||
|
|
expected = merge(data, to_join.reset_index(),
|
||
|
|
left_on=['key1', 'key2'],
|
||
|
|
right_on=['first', 'second'], how='inner',
|
||
|
|
sort=False)
|
||
|
|
|
||
|
|
expected2 = merge(to_join, data,
|
||
|
|
right_on=['key1', 'key2'], left_index=True,
|
||
|
|
how='inner', sort=False)
|
||
|
|
assert_frame_equal(joined, expected2.reindex_like(joined))
|
||
|
|
|
||
|
|
expected2 = merge(to_join, data, right_on=['key1', 'key2'],
|
||
|
|
left_index=True, how='inner', sort=False)
|
||
|
|
|
||
|
|
expected = expected.drop(['first', 'second'], axis=1)
|
||
|
|
expected.index = joined.index
|
||
|
|
|
||
|
|
assert joined.index.is_monotonic
|
||
|
|
assert_frame_equal(joined, expected)
|
||
|
|
|
||
|
|
# _assert_same_contents(expected, expected2.loc[:, expected.columns])
|
||
|
|
|
||
|
|
def test_join_hierarchical_mixed(self):
|
||
|
|
# GH 2024
|
||
|
|
df = DataFrame([(1, 2, 3), (4, 5, 6)], columns=['a', 'b', 'c'])
|
||
|
|
new_df = df.groupby(['a']).agg({'b': [np.mean, np.sum]})
|
||
|
|
other_df = DataFrame(
|
||
|
|
[(1, 2, 3), (7, 10, 6)], columns=['a', 'b', 'd'])
|
||
|
|
other_df.set_index('a', inplace=True)
|
||
|
|
# GH 9455, 12219
|
||
|
|
with tm.assert_produces_warning(UserWarning):
|
||
|
|
result = merge(new_df, other_df, left_index=True, right_index=True)
|
||
|
|
assert ('b', 'mean') in result
|
||
|
|
assert 'b' in result
|
||
|
|
|
||
|
|
def test_join_float64_float32(self):
|
||
|
|
|
||
|
|
a = DataFrame(randn(10, 2), columns=['a', 'b'], dtype=np.float64)
|
||
|
|
b = DataFrame(randn(10, 1), columns=['c'], dtype=np.float32)
|
||
|
|
joined = a.join(b)
|
||
|
|
assert joined.dtypes['a'] == 'float64'
|
||
|
|
assert joined.dtypes['b'] == 'float64'
|
||
|
|
assert joined.dtypes['c'] == 'float32'
|
||
|
|
|
||
|
|
a = np.random.randint(0, 5, 100).astype('int64')
|
||
|
|
b = np.random.random(100).astype('float64')
|
||
|
|
c = np.random.random(100).astype('float32')
|
||
|
|
df = DataFrame({'a': a, 'b': b, 'c': c})
|
||
|
|
xpdf = DataFrame({'a': a, 'b': b, 'c': c})
|
||
|
|
s = DataFrame(np.random.random(5).astype('float32'), columns=['md'])
|
||
|
|
rs = df.merge(s, left_on='a', right_index=True)
|
||
|
|
assert rs.dtypes['a'] == 'int64'
|
||
|
|
assert rs.dtypes['b'] == 'float64'
|
||
|
|
assert rs.dtypes['c'] == 'float32'
|
||
|
|
assert rs.dtypes['md'] == 'float32'
|
||
|
|
|
||
|
|
xp = xpdf.merge(s, left_on='a', right_index=True)
|
||
|
|
assert_frame_equal(rs, xp)
|
||
|
|
|
||
|
|
def test_join_many_non_unique_index(self):
|
||
|
|
df1 = DataFrame({"a": [1, 1], "b": [1, 1], "c": [10, 20]})
|
||
|
|
df2 = DataFrame({"a": [1, 1], "b": [1, 2], "d": [100, 200]})
|
||
|
|
df3 = DataFrame({"a": [1, 1], "b": [1, 2], "e": [1000, 2000]})
|
||
|
|
idf1 = df1.set_index(["a", "b"])
|
||
|
|
idf2 = df2.set_index(["a", "b"])
|
||
|
|
idf3 = df3.set_index(["a", "b"])
|
||
|
|
|
||
|
|
result = idf1.join([idf2, idf3], how='outer')
|
||
|
|
|
||
|
|
df_partially_merged = merge(df1, df2, on=['a', 'b'], how='outer')
|
||
|
|
expected = merge(df_partially_merged, df3, on=['a', 'b'], how='outer')
|
||
|
|
|
||
|
|
result = result.reset_index()
|
||
|
|
expected = expected[result.columns]
|
||
|
|
expected['a'] = expected.a.astype('int64')
|
||
|
|
expected['b'] = expected.b.astype('int64')
|
||
|
|
assert_frame_equal(result, expected)
|
||
|
|
|
||
|
|
df1 = DataFrame({"a": [1, 1, 1], "b": [1, 1, 1], "c": [10, 20, 30]})
|
||
|
|
df2 = DataFrame({"a": [1, 1, 1], "b": [1, 1, 2], "d": [100, 200, 300]})
|
||
|
|
df3 = DataFrame(
|
||
|
|
{"a": [1, 1, 1], "b": [1, 1, 2], "e": [1000, 2000, 3000]})
|
||
|
|
idf1 = df1.set_index(["a", "b"])
|
||
|
|
idf2 = df2.set_index(["a", "b"])
|
||
|
|
idf3 = df3.set_index(["a", "b"])
|
||
|
|
result = idf1.join([idf2, idf3], how='inner')
|
||
|
|
|
||
|
|
df_partially_merged = merge(df1, df2, on=['a', 'b'], how='inner')
|
||
|
|
expected = merge(df_partially_merged, df3, on=['a', 'b'], how='inner')
|
||
|
|
|
||
|
|
result = result.reset_index()
|
||
|
|
|
||
|
|
assert_frame_equal(result, expected.loc[:, result.columns])
|
||
|
|
|
||
|
|
# GH 11519
|
||
|
|
df = DataFrame({'A': ['foo', 'bar', 'foo', 'bar',
|
||
|
|
'foo', 'bar', 'foo', 'foo'],
|
||
|
|
'B': ['one', 'one', 'two', 'three',
|
||
|
|
'two', 'two', 'one', 'three'],
|
||
|
|
'C': np.random.randn(8),
|
||
|
|
'D': np.random.randn(8)})
|
||
|
|
s = Series(np.repeat(np.arange(8), 2),
|
||
|
|
index=np.repeat(np.arange(8), 2), name='TEST')
|
||
|
|
inner = df.join(s, how='inner')
|
||
|
|
outer = df.join(s, how='outer')
|
||
|
|
left = df.join(s, how='left')
|
||
|
|
right = df.join(s, how='right')
|
||
|
|
assert_frame_equal(inner, outer)
|
||
|
|
assert_frame_equal(inner, left)
|
||
|
|
assert_frame_equal(inner, right)
|
||
|
|
|
||
|
|
def test_join_sort(self):
|
||
|
|
left = DataFrame({'key': ['foo', 'bar', 'baz', 'foo'],
|
||
|
|
'value': [1, 2, 3, 4]})
|
||
|
|
right = DataFrame({'value2': ['a', 'b', 'c']},
|
||
|
|
index=['bar', 'baz', 'foo'])
|
||
|
|
|
||
|
|
joined = left.join(right, on='key', sort=True)
|
||
|
|
expected = DataFrame({'key': ['bar', 'baz', 'foo', 'foo'],
|
||
|
|
'value': [2, 3, 1, 4],
|
||
|
|
'value2': ['a', 'b', 'c', 'c']},
|
||
|
|
index=[1, 2, 0, 3])
|
||
|
|
assert_frame_equal(joined, expected)
|
||
|
|
|
||
|
|
# smoke test
|
||
|
|
joined = left.join(right, on='key', sort=False)
|
||
|
|
tm.assert_index_equal(joined.index, pd.Index(lrange(4)))
|
||
|
|
|
||
|
|
def test_join_mixed_non_unique_index(self):
|
||
|
|
# GH 12814, unorderable types in py3 with a non-unique index
|
||
|
|
df1 = DataFrame({'a': [1, 2, 3, 4]}, index=[1, 2, 3, 'a'])
|
||
|
|
df2 = DataFrame({'b': [5, 6, 7, 8]}, index=[1, 3, 3, 4])
|
||
|
|
result = df1.join(df2)
|
||
|
|
expected = DataFrame({'a': [1, 2, 3, 3, 4],
|
||
|
|
'b': [5, np.nan, 6, 7, np.nan]},
|
||
|
|
index=[1, 2, 3, 3, 'a'])
|
||
|
|
tm.assert_frame_equal(result, expected)
|
||
|
|
|
||
|
|
df3 = DataFrame({'a': [1, 2, 3, 4]}, index=[1, 2, 2, 'a'])
|
||
|
|
df4 = DataFrame({'b': [5, 6, 7, 8]}, index=[1, 2, 3, 4])
|
||
|
|
result = df3.join(df4)
|
||
|
|
expected = DataFrame({'a': [1, 2, 3, 4], 'b': [5, 6, 6, np.nan]},
|
||
|
|
index=[1, 2, 2, 'a'])
|
||
|
|
tm.assert_frame_equal(result, expected)
|
||
|
|
|
||
|
|
def test_join_non_unique_period_index(self):
|
||
|
|
# GH #16871
|
||
|
|
index = pd.period_range('2016-01-01', periods=16, freq='M')
|
||
|
|
df = DataFrame([i for i in range(len(index))],
|
||
|
|
index=index, columns=['pnum'])
|
||
|
|
df2 = concat([df, df])
|
||
|
|
result = df.join(df2, how='inner', rsuffix='_df2')
|
||
|
|
expected = DataFrame(
|
||
|
|
np.tile(np.arange(16, dtype=np.int64).repeat(2).reshape(-1, 1), 2),
|
||
|
|
columns=['pnum', 'pnum_df2'], index=df2.sort_index().index)
|
||
|
|
tm.assert_frame_equal(result, expected)
|
||
|
|
|
||
|
|
def test_mixed_type_join_with_suffix(self):
|
||
|
|
# GH #916
|
||
|
|
df = DataFrame(np.random.randn(20, 6),
|
||
|
|
columns=['a', 'b', 'c', 'd', 'e', 'f'])
|
||
|
|
df.insert(0, 'id', 0)
|
||
|
|
df.insert(5, 'dt', 'foo')
|
||
|
|
|
||
|
|
grouped = df.groupby('id')
|
||
|
|
mn = grouped.mean()
|
||
|
|
cn = grouped.count()
|
||
|
|
|
||
|
|
# it works!
|
||
|
|
mn.join(cn, rsuffix='_right')
|
||
|
|
|
||
|
|
def test_join_many(self):
|
||
|
|
df = DataFrame(np.random.randn(10, 6), columns=list('abcdef'))
|
||
|
|
df_list = [df[['a', 'b']], df[['c', 'd']], df[['e', 'f']]]
|
||
|
|
|
||
|
|
joined = df_list[0].join(df_list[1:])
|
||
|
|
tm.assert_frame_equal(joined, df)
|
||
|
|
|
||
|
|
df_list = [df[['a', 'b']][:-2],
|
||
|
|
df[['c', 'd']][2:], df[['e', 'f']][1:9]]
|
||
|
|
|
||
|
|
def _check_diff_index(df_list, result, exp_index):
|
||
|
|
reindexed = [x.reindex(exp_index) for x in df_list]
|
||
|
|
expected = reindexed[0].join(reindexed[1:])
|
||
|
|
tm.assert_frame_equal(result, expected)
|
||
|
|
|
||
|
|
# different join types
|
||
|
|
joined = df_list[0].join(df_list[1:], how='outer')
|
||
|
|
_check_diff_index(df_list, joined, df.index)
|
||
|
|
|
||
|
|
joined = df_list[0].join(df_list[1:])
|
||
|
|
_check_diff_index(df_list, joined, df_list[0].index)
|
||
|
|
|
||
|
|
joined = df_list[0].join(df_list[1:], how='inner')
|
||
|
|
_check_diff_index(df_list, joined, df.index[2:8])
|
||
|
|
|
||
|
|
pytest.raises(ValueError, df_list[0].join, df_list[1:], on='a')
|
||
|
|
|
||
|
|
def test_join_many_mixed(self):
|
||
|
|
df = DataFrame(np.random.randn(8, 4), columns=['A', 'B', 'C', 'D'])
|
||
|
|
df['key'] = ['foo', 'bar'] * 4
|
||
|
|
df1 = df.loc[:, ['A', 'B']]
|
||
|
|
df2 = df.loc[:, ['C', 'D']]
|
||
|
|
df3 = df.loc[:, ['key']]
|
||
|
|
|
||
|
|
result = df1.join([df2, df3])
|
||
|
|
assert_frame_equal(result, df)
|
||
|
|
|
||
|
|
def test_join_dups(self):
|
||
|
|
|
||
|
|
# joining dups
|
||
|
|
df = concat([DataFrame(np.random.randn(10, 4),
|
||
|
|
columns=['A', 'A', 'B', 'B']),
|
||
|
|
DataFrame(np.random.randint(0, 10, size=20)
|
||
|
|
.reshape(10, 2),
|
||
|
|
columns=['A', 'C'])],
|
||
|
|
axis=1)
|
||
|
|
|
||
|
|
expected = concat([df, df], axis=1)
|
||
|
|
result = df.join(df, rsuffix='_2')
|
||
|
|
result.columns = expected.columns
|
||
|
|
assert_frame_equal(result, expected)
|
||
|
|
|
||
|
|
# GH 4975, invalid join on dups
|
||
|
|
w = DataFrame(np.random.randn(4, 2), columns=["x", "y"])
|
||
|
|
x = DataFrame(np.random.randn(4, 2), columns=["x", "y"])
|
||
|
|
y = DataFrame(np.random.randn(4, 2), columns=["x", "y"])
|
||
|
|
z = DataFrame(np.random.randn(4, 2), columns=["x", "y"])
|
||
|
|
|
||
|
|
dta = x.merge(y, left_index=True, right_index=True).merge(
|
||
|
|
z, left_index=True, right_index=True, how="outer")
|
||
|
|
dta = dta.merge(w, left_index=True, right_index=True)
|
||
|
|
expected = concat([x, y, z, w], axis=1)
|
||
|
|
expected.columns = ['x_x', 'y_x', 'x_y',
|
||
|
|
'y_y', 'x_x', 'y_x', 'x_y', 'y_y']
|
||
|
|
assert_frame_equal(dta, expected)
|
||
|
|
|
||
|
|
def test_panel_join(self):
|
||
|
|
with catch_warnings(record=True):
|
||
|
|
panel = tm.makePanel()
|
||
|
|
tm.add_nans(panel)
|
||
|
|
|
||
|
|
p1 = panel.iloc[:2, :10, :3]
|
||
|
|
p2 = panel.iloc[2:, 5:, 2:]
|
||
|
|
|
||
|
|
# left join
|
||
|
|
result = p1.join(p2)
|
||
|
|
expected = p1.copy()
|
||
|
|
expected['ItemC'] = p2['ItemC']
|
||
|
|
tm.assert_panel_equal(result, expected)
|
||
|
|
|
||
|
|
# right join
|
||
|
|
result = p1.join(p2, how='right')
|
||
|
|
expected = p2.copy()
|
||
|
|
expected['ItemA'] = p1['ItemA']
|
||
|
|
expected['ItemB'] = p1['ItemB']
|
||
|
|
expected = expected.reindex(items=['ItemA', 'ItemB', 'ItemC'])
|
||
|
|
tm.assert_panel_equal(result, expected)
|
||
|
|
|
||
|
|
# inner join
|
||
|
|
result = p1.join(p2, how='inner')
|
||
|
|
expected = panel.iloc[:, 5:10, 2:3]
|
||
|
|
tm.assert_panel_equal(result, expected)
|
||
|
|
|
||
|
|
# outer join
|
||
|
|
result = p1.join(p2, how='outer')
|
||
|
|
expected = p1.reindex(major=panel.major_axis,
|
||
|
|
minor=panel.minor_axis)
|
||
|
|
expected = expected.join(p2.reindex(major=panel.major_axis,
|
||
|
|
minor=panel.minor_axis))
|
||
|
|
tm.assert_panel_equal(result, expected)
|
||
|
|
|
||
|
|
def test_panel_join_overlap(self):
|
||
|
|
with catch_warnings(record=True):
|
||
|
|
panel = tm.makePanel()
|
||
|
|
tm.add_nans(panel)
|
||
|
|
|
||
|
|
p1 = panel.loc[['ItemA', 'ItemB', 'ItemC']]
|
||
|
|
p2 = panel.loc[['ItemB', 'ItemC']]
|
||
|
|
|
||
|
|
# Expected index is
|
||
|
|
#
|
||
|
|
# ItemA, ItemB_p1, ItemC_p1, ItemB_p2, ItemC_p2
|
||
|
|
joined = p1.join(p2, lsuffix='_p1', rsuffix='_p2')
|
||
|
|
p1_suf = p1.loc[['ItemB', 'ItemC']].add_suffix('_p1')
|
||
|
|
p2_suf = p2.loc[['ItemB', 'ItemC']].add_suffix('_p2')
|
||
|
|
no_overlap = panel.loc[['ItemA']]
|
||
|
|
expected = no_overlap.join(p1_suf.join(p2_suf))
|
||
|
|
tm.assert_panel_equal(joined, expected)
|
||
|
|
|
||
|
|
def test_panel_join_many(self):
|
||
|
|
with catch_warnings(record=True):
|
||
|
|
tm.K = 10
|
||
|
|
panel = tm.makePanel()
|
||
|
|
tm.K = 4
|
||
|
|
|
||
|
|
panels = [panel.iloc[:2], panel.iloc[2:6], panel.iloc[6:]]
|
||
|
|
|
||
|
|
joined = panels[0].join(panels[1:])
|
||
|
|
tm.assert_panel_equal(joined, panel)
|
||
|
|
|
||
|
|
panels = [panel.iloc[:2, :-5],
|
||
|
|
panel.iloc[2:6, 2:],
|
||
|
|
panel.iloc[6:, 5:-7]]
|
||
|
|
|
||
|
|
data_dict = {}
|
||
|
|
for p in panels:
|
||
|
|
data_dict.update(p.iteritems())
|
||
|
|
|
||
|
|
joined = panels[0].join(panels[1:], how='inner')
|
||
|
|
expected = pd.Panel.from_dict(data_dict, intersect=True)
|
||
|
|
tm.assert_panel_equal(joined, expected)
|
||
|
|
|
||
|
|
joined = panels[0].join(panels[1:], how='outer')
|
||
|
|
expected = pd.Panel.from_dict(data_dict, intersect=False)
|
||
|
|
tm.assert_panel_equal(joined, expected)
|
||
|
|
|
||
|
|
# edge cases
|
||
|
|
pytest.raises(ValueError, panels[0].join, panels[1:],
|
||
|
|
how='outer', lsuffix='foo', rsuffix='bar')
|
||
|
|
pytest.raises(ValueError, panels[0].join, panels[1:],
|
||
|
|
how='right')
|
||
|
|
|
||
|
|
|
||
|
|
def _check_join(left, right, result, join_col, how='left',
|
||
|
|
lsuffix='_x', rsuffix='_y'):
|
||
|
|
|
||
|
|
# some smoke tests
|
||
|
|
for c in join_col:
|
||
|
|
assert(result[c].notna().all())
|
||
|
|
|
||
|
|
left_grouped = left.groupby(join_col)
|
||
|
|
right_grouped = right.groupby(join_col)
|
||
|
|
|
||
|
|
for group_key, group in result.groupby(join_col):
|
||
|
|
l_joined = _restrict_to_columns(group, left.columns, lsuffix)
|
||
|
|
r_joined = _restrict_to_columns(group, right.columns, rsuffix)
|
||
|
|
|
||
|
|
try:
|
||
|
|
lgroup = left_grouped.get_group(group_key)
|
||
|
|
except KeyError:
|
||
|
|
if how in ('left', 'inner'):
|
||
|
|
raise AssertionError('key %s should not have been in the join'
|
||
|
|
% str(group_key))
|
||
|
|
|
||
|
|
_assert_all_na(l_joined, left.columns, join_col)
|
||
|
|
else:
|
||
|
|
_assert_same_contents(l_joined, lgroup)
|
||
|
|
|
||
|
|
try:
|
||
|
|
rgroup = right_grouped.get_group(group_key)
|
||
|
|
except KeyError:
|
||
|
|
if how in ('right', 'inner'):
|
||
|
|
raise AssertionError('key %s should not have been in the join'
|
||
|
|
% str(group_key))
|
||
|
|
|
||
|
|
_assert_all_na(r_joined, right.columns, join_col)
|
||
|
|
else:
|
||
|
|
_assert_same_contents(r_joined, rgroup)
|
||
|
|
|
||
|
|
|
||
|
|
def _restrict_to_columns(group, columns, suffix):
|
||
|
|
found = [c for c in group.columns
|
||
|
|
if c in columns or c.replace(suffix, '') in columns]
|
||
|
|
|
||
|
|
# filter
|
||
|
|
group = group.loc[:, found]
|
||
|
|
|
||
|
|
# get rid of suffixes, if any
|
||
|
|
group = group.rename(columns=lambda x: x.replace(suffix, ''))
|
||
|
|
|
||
|
|
# put in the right order...
|
||
|
|
group = group.loc[:, columns]
|
||
|
|
|
||
|
|
return group
|
||
|
|
|
||
|
|
|
||
|
|
def _assert_same_contents(join_chunk, source):
|
||
|
|
NA_SENTINEL = -1234567 # drop_duplicates not so NA-friendly...
|
||
|
|
|
||
|
|
jvalues = join_chunk.fillna(NA_SENTINEL).drop_duplicates().values
|
||
|
|
svalues = source.fillna(NA_SENTINEL).drop_duplicates().values
|
||
|
|
|
||
|
|
rows = {tuple(row) for row in jvalues}
|
||
|
|
assert(len(rows) == len(source))
|
||
|
|
assert(all(tuple(row) in rows for row in svalues))
|
||
|
|
|
||
|
|
|
||
|
|
def _assert_all_na(join_chunk, source_columns, join_col):
|
||
|
|
for c in source_columns:
|
||
|
|
if c in join_col:
|
||
|
|
continue
|
||
|
|
assert(join_chunk[c].isna().all())
|
||
|
|
|
||
|
|
|
||
|
|
def _join_by_hand(a, b, how='left'):
|
||
|
|
join_index = a.index.join(b.index, how=how)
|
||
|
|
|
||
|
|
a_re = a.reindex(join_index)
|
||
|
|
b_re = b.reindex(join_index)
|
||
|
|
|
||
|
|
result_columns = a.columns.append(b.columns)
|
||
|
|
|
||
|
|
for col, s in compat.iteritems(b_re):
|
||
|
|
a_re[col] = s
|
||
|
|
return a_re.reindex(columns=result_columns)
|