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BUG: DataFrame.apply axis=1 for str ops with no axis argument #39211

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rhshadrach opened this issue Jan 16, 2021 · 0 comments · Fixed by #39212
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BUG: DataFrame.apply axis=1 for str ops with no axis argument #39211

rhshadrach opened this issue Jan 16, 2021 · 0 comments · Fixed by #39212
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@rhshadrach
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Apply Apply, Aggregate, Transform, Map Bug
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1.3

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@rhshadrach
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E.g.

df = pd.DataFrame({'a': [1, 2], 'b': [3, 4]})
print(df.apply('pct_change', axis=0))
print(df.apply('pct_change', axis=1))

both give the output

     a         b
0  NaN       NaN
1  1.0  0.333333

This should instead raise rather than silently give incorrect results.
@rhshadrach rhshadrach added Bug Apply Apply, Aggregate, Transform, Map labels Jan 16, 2021
@rhshadrach rhshadrach self-assigned this Jan 16, 2021
@rhshadrach rhshadrach mentioned this issue Jan 16, 2021
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@jreback jreback added this to the 1.3 milestone Jan 17, 2021
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@rhshadrach rhshadrach

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BUG: DataFrame.apply axis=1 for str ops with no axis argument rhshadrach/pandas
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