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TST: Concat MultiIndex dataframes with deepcopy (#9967) #14936

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Dec 22, 2016
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TST: Concat MultiIndex dataframes with deepcopy (#9967) #14936

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21 changes: 21 additions & 0 deletions pandas/tools/tests/test_concat.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2151,6 +2151,27 @@ def test_concat_multiindex_rangeindex(self):
exp = df.iloc[[2, 3, 4, 5], :]
tm.assert_frame_equal(res, exp)

def test_concat_multiindex_dfs_with_deepcopy(self):
# GH 9967
from copy import deepcopy
example_multiindex1 = pd.MultiIndex.from_product([['a'], ['b']])
example_dataframe1 = pd.DataFrame([0], index=example_multiindex1)

example_multiindex2 = pd.MultiIndex.from_product([['a'], ['c']])
example_dataframe2 = pd.DataFrame([1], index=example_multiindex2)

example_dict = {'s1': example_dataframe1, 's2': example_dataframe2}
expected_index = pd.MultiIndex(levels=[['s1', 's2'],
['a'],
['b', 'c']],
labels=[[0, 1], [0, 0], [0, 1]],
names=['testname', None, None])
expected = pd.DataFrame([[0], [1]], index=expected_index)
result_copy = pd.concat(deepcopy(example_dict), names=['testname'])
tm.assert_frame_equal(result_copy, expected)
result_no_copy = pd.concat(example_dict, names=['testname'])
tm.assert_frame_equal(result_no_copy, expected)


if __name__ == '__main__':
nose.runmodule(argv=[__file__, '-vvs', '-x', '--pdb', '--pdb-failure'],
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