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TST add test case for drop_duplicates #35121

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Merged
merged 5 commits into from
Jul 8, 2020
Merged

TST add test case for drop_duplicates #35121

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5c0a095
TST add test case to drop_duplicates for inplace=True
r-toroxel Jul 3, 2020
b004e05
Merge remote-tracking branch 'upstream/master'
r-toroxel Jul 4, 2020
6b940bb
CLN PEP-8
r-toroxel Jul 4, 2020
4b8679c
TST move to existing test
r-toroxel Jul 7, 2020
cb2ab5e
CLN remove parenthesis
r-toroxel Jul 7, 2020
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27 changes: 18 additions & 9 deletions pandas/tests/frame/methods/test_drop_duplicates.py
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Original file line number Diff line number Diff line change
Expand Up @@ -333,64 +333,73 @@ def test_drop_duplicates_inplace():
)
# single column
df = orig.copy()
df.drop_duplicates("A", inplace=True)
return_value = df.drop_duplicates("A", inplace=True)
expected = orig[:2]
result = df
tm.assert_frame_equal(result, expected)
assert(return_value is None)
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Nit: You can remove the parenthesis from all of these asserts

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thx!


df = orig.copy()
df.drop_duplicates("A", keep="last", inplace=True)
return_value = df.drop_duplicates("A", keep="last", inplace=True)
expected = orig.loc[[6, 7]]
result = df
tm.assert_frame_equal(result, expected)
assert (return_value is None)

df = orig.copy()
df.drop_duplicates("A", keep=False, inplace=True)
return_value = df.drop_duplicates("A", keep=False, inplace=True)
expected = orig.loc[[]]
result = df
tm.assert_frame_equal(result, expected)
assert len(df) == 0
assert (return_value is None)

# multi column
df = orig.copy()
df.drop_duplicates(["A", "B"], inplace=True)
return_value = df.drop_duplicates(["A", "B"], inplace=True)
expected = orig.loc[[0, 1, 2, 3]]
result = df
tm.assert_frame_equal(result, expected)
assert (return_value is None)

df = orig.copy()
df.drop_duplicates(["A", "B"], keep="last", inplace=True)
return_value = df.drop_duplicates(["A", "B"], keep="last", inplace=True)
expected = orig.loc[[0, 5, 6, 7]]
result = df
tm.assert_frame_equal(result, expected)
assert (return_value is None)

df = orig.copy()
df.drop_duplicates(["A", "B"], keep=False, inplace=True)
return_value = df.drop_duplicates(["A", "B"], keep=False, inplace=True)
expected = orig.loc[[0]]
result = df
tm.assert_frame_equal(result, expected)
assert (return_value is None)

# consider everything
orig2 = orig.loc[:, ["A", "B", "C"]].copy()

df2 = orig2.copy()
df2.drop_duplicates(inplace=True)
return_value = df2.drop_duplicates(inplace=True)
# in this case only
expected = orig2.drop_duplicates(["A", "B"])
result = df2
tm.assert_frame_equal(result, expected)
assert (return_value is None)

df2 = orig2.copy()
df2.drop_duplicates(keep="last", inplace=True)
return_value = df2.drop_duplicates(keep="last", inplace=True)
expected = orig2.drop_duplicates(["A", "B"], keep="last")
result = df2
tm.assert_frame_equal(result, expected)
assert (return_value is None)

df2 = orig2.copy()
df2.drop_duplicates(keep=False, inplace=True)
return_value = df2.drop_duplicates(keep=False, inplace=True)
expected = orig2.drop_duplicates(["A", "B"], keep=False)
result = df2
tm.assert_frame_equal(result, expected)
assert (return_value is None)


@pytest.mark.parametrize("inplace", [True, False])
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