GroupBy.apply can't yield Series with DataFrame input (original) (raw)
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GroupBy.apply can't yield Series with DataFrame input
#131
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In [23]: import pandas.util.testing as tm
In [24]: df = tm.makeTimeDataFrame()
In [25]: df.groupby(lambda x: x.month).count()
Out[25]:
A B C D
1 21 21 21 21
2 9 9 9 9
In [26]: df.groupby(lambda x: x.month).apply(len)
Exception
you want to get a Series like:
1 21
2 9
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