BUG: Groupby.transform('cumcount') fails · Issue #27472 · pandas-dev/pandas (original) (raw)

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Description

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

g.cumcount()

fails

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

cumcount is a cythonized function.