/site-packages/pandas/core/groupby/generic.py in aggregate(self, func, engine, engine_kwargs, *args,/anaconda/envs/azureml_py36/lib/python3.6/site-packages/pandas/core/base.py in _a
一个给我想要的结果,另一个给出一个错误DataError: No numeric types to aggregate。(level='x').alpha.mean()
/film/tools/packages/pandas/0.18.0/CentOS-6.2_thru_7/python-2.7/lib/python2.7/site-packages