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TST: Add testing to df.where() typecasting as per GH 42295 #43173

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Merged
merged 6 commits into from
Aug 26, 2021
Merged

TST: Add testing to df.where() typecasting as per GH 42295 #43173

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b527faa
Add testing to df.where() typecasting as per GH 42295
Aug 23, 2021
71c8033
Fix style
Aug 23, 2021
25359fc
Directly compare data frames
Aug 23, 2021
2db7a1d
Fix pre-commit
Aug 23, 2021
fc914c9
Rename dataframe to df
Aug 23, 2021
0675359
create expected before calling where
Aug 23, 2021
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10 changes: 10 additions & 0 deletions pandas/tests/frame/indexing/test_where.py
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Original file line number Diff line number Diff line change
Expand Up @@ -771,3 +771,13 @@ def test_where_non_keyword_deprecation():
result = s.where(s > 1, 10, False)
expected = DataFrame([10, 10, 2, 3, 4])
tm.assert_frame_equal(expected, result)


def test_where_columns_casting():
# GH 42295

d1 = DataFrame({"a": [1.0, 2.0], "b": [3, np.nan]})
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Please call df for consistency and create expected = df.copy() before applying where

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Please create expected before calling where.

result = d1.where(pd.notnull(d1), None)
# make sure dtypes don't change
expected = d1
tm.assert_frame_equal(expected, result)