本人小菜鸟一枚，在pycharm 2.7里面运行这句出线了错误
trainData['int_rate_clean'] = trainData['int_rate'].map(lambda x: str(x.replace("%","")))

A value is trying to be set on a copy of a slice from a DataFrame.
Try using .loc[row_indexer,col_indexer] = value instead

See the caveats in the documentation: http://pandas.pydata.org/pandas- ... ng-view-versus-copy
  trainData['int_rate_clean'] = trainData['int_rate'].map(lambda x: str(x.replace("%","")))


不知道什么原因，有人知道吗？感激不尽