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BUG: Groupby.transform('size') fails for multicolumn frame #27469

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ghost opened this issue Jul 19, 2019 · 0 comments · Fixed by #45716
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BUG: Groupby.transform('size') fails for multicolumn frame #27469

ghost opened this issue Jul 19, 2019 · 0 comments · Fixed by #45716
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Apply Apply, Aggregate, Transform, Map Bug Groupby
Milestone
1.5

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@ghost
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ghost commented Jul 19, 2019 •
edited by ghost
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Adding tests for #27467 surfaced some bugs:

from pandas import *
df = DataFrame(dict(a=[0, 0, 0, 1, 1, 1], b=range(6)))
g = df.groupby(np.repeat([0,1], 3))
# ok
print(g.size()) 
#fails
g.transform('size') 
TypeError: Transform function invalid for data types
@rhshadrach rhshadrach added the Apply Apply, Aggregate, Transform, Map label Jan 30, 2022
This was referenced Jan 30, 2022
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@jreback jreback added this to the 1.5 milestone Jan 30, 2022
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BUG: DataFrameGroupby.transform("size") fails rhshadrach/pandas
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@jreback @jbrockmendel @rhshadrach