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TST:add test for df replace GH34871 #34904

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Merged
merged 4 commits into from
Jun 24, 2020
Merged

TST:add test for df replace GH34871 #34904

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59e6367
initial version of regression test for GH#34871
nwweber Jun 20, 2020
81b6058
reduce test to only fail for exception
nwweber Jun 20, 2020
fd4ed7e
adress change request for PR
nwweber Jun 21, 2020
df9d476
test for desired behavior and xfail for now
nwweber Jun 24, 2020
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13 changes: 13 additions & 0 deletions pandas/tests/frame/methods/test_replace.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1403,3 +1403,16 @@ def test_replace_with_duplicate_columns(self, replacement):
result["B"] = result["B"].replace(7, replacement)

tm.assert_frame_equal(result, expected)

@pytest.mark.xfail(
reason="replace() changes dtype from period to object, see GH34871", strict=True
)
def test_replace_period_ignore_float(self):
"""
Regression test for GH#34871: if df.replace(1.0, 0.0) is called on a df
with a Period column the old, faulty behavior is to raise TypeError.
"""
df = pd.DataFrame({"Per": [pd.Period("2020-01")] * 3})
result = df.replace(1.0, 0.0)
expected = pd.DataFrame({"Per": [pd.Period("2020-01")] * 3})
tm.assert_frame_equal(expected, result)