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Maintain inplace operation on series #36498

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1497988
Not deleting cacher
samilAyoub Sep 20, 2020
b2b9bd6
add unit test to check if + operation on Series updating parent DataF…
samilAyoub Sep 20, 2020
f7b0893
solve PEP 8 issues
samilAyoub Sep 20, 2020
816425c
more PEP 8 issues
samilAyoub Sep 20, 2020
8494202
PEP 8 issues ...
samilAyoub Sep 20, 2020
e9d6447
Merge branch 'maintain_inplace_operation_on_series' of https://github…
samilAyoub Sep 20, 2020
7277d38
PEP8 ...
samilAyoub Sep 20, 2020
5cbe60f
Merge remote-tracking branch 'upstream/master' into maintain_inplace_…
simonjayhawkins Sep 25, 2020
dc5e8a1
update test
simonjayhawkins Sep 25, 2020
acb3c02
lint and comment
simonjayhawkins Sep 25, 2020
ffc051f
fix failing tests
simonjayhawkins Sep 25, 2020
8640237
remove failing test
simonjayhawkins Sep 25, 2020
56a4c88
add release note
simonjayhawkins Sep 25, 2020
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2 changes: 0 additions & 2 deletions pandas/core/ops/methods.py
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Original file line number Diff line number Diff line change
Expand Up @@ -93,8 +93,6 @@ def _wrap_inplace_method(method):

def f(self, other):
result = method(self, other)
# Delete cacher
self._reset_cacher()
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This was added to fix an existing bug (see #30501) so removing it would likely cause a regression

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could this have been the incorrect location for the original fix? it appears there were a couple of iterations in #30501.

# this makes sure that we are aligned like the input
# we are updating inplace so we want to ignore is_copy
self._update_inplace(
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7 changes: 7 additions & 0 deletions pandas/tests/arithmetic/test_numeric.py
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Expand Up @@ -1297,3 +1297,10 @@ def test_dataframe_div_silenced():
)
with tm.assert_produces_warning(None):
pdf1.div(pdf2, fill_value=0)


def test_inplace_arithmetic_operation_on_series_updating_parent_dataframe():
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this test passes for me on master. is there another case that fails?

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yes I think need to test df["A"] is s which is also True on 1.1.2

>>> pd.__version__
'1.1.2'
>>>
>>> import pandas.testing as tm
>>>
>>> df = pd.DataFrame({"A": [1, 2, 3]})
>>> s = df["A"]
>>> s += 1
>>> tm.assert_series_equal(df["A"], s)
>>>
>>> s
0    2
1    3
2    4
Name: A, dtype: int64
>>>
>>> df["A"]
0    2
1    3
2    4
Name: A, dtype: int64
>>>
>>> df
   A
0  1
1  2
2  3
>>> df["A"] is s
True
>>>

but the output of __repr__ and also other ops is incorrect

so should also compare using assert_frame_equal

>>> tm.assert_frame_equal(df, pd.DataFrame({"A": [2, 3, 4]}))
Traceback (most recent call last):
...
AssertionError: DataFrame.iloc[:, 0] (column name="A") are different

DataFrame.iloc[:, 0] (column name="A") values are different (100.0 %)
[index]: [0, 1, 2]
[left]:  [1, 2, 3]
[right]: [2, 3, 4]
>>>

but this should pass with the fix here

df = pd.DataFrame({"A": [1, 2, 3]})
s = df["A"]
s += 1
tm.assert_series_equal(df["A"], s)