How to deal with this Pandas warning?
data1.loc['2012-1,'yb']=list(y2)
the 'yb' column is a new column,the pandas's warning is "SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame.Try using .loc[row_index,col_indexer] = value instead"

how to fix it?
