BUG: Groupby.transform('ngroup') fails #27468

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ghost opened this issue Jul 19, 2019 · 1 comment

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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.ngroup()) 
#fails
g.transform('ngroup') 
AttributeError: ("'Series' object has no attribute 'ngroup'", 'occurred at index a')

jbrockmendel added Bug Groupby labels

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mroeschke commented Apr 28, 2023

This looks to work on main and looks like we have tests for this so closing

mroeschke closed this as completed

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