import pandas as pd
import numpy as np
from pandas.tseries.resample import TimeGrouper
import pandas.util.testing as tm
df = tm.makeTimeDataFrame()
tg = TimeGrouper('M')
func = lambda x: (x - 1)
df.groupby(tg).transform(func)
/externals/pandas/pandas/core/groupby.py in _get_compressed_labels(self)
1360 def _get_compressed_labels(self):
-> 1361 all_labels = [ping.labels for ping in self.groupings]
1362 if self._overflow_possible:
TypeError: 'NoneType' object is not iterable
Seems related to #8049 as that check group_info which errors on BinGrouper since there are no groupings
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