A value is trying to be set on a copy of a slice from a DataFrame

 

A value is trying to be set on a copy of a slice from a DataFrame

df_delta_fred.delta_thk[df_delta_fred.delta_thk < 0] = 0

解决报错：

df_delta_fred.loc[(df_delta_fred.delta_thk < 0), 'delta_thk'] = 0