:1: SettingWithCopyWarning: 试图在 DataFrame 中的切片副本上设置一个值。尝试改用 .loc[row_indexer,col_indexer] = value
请参阅文档中的注意事项：https: //pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy X_train['business_code_enc'] = business_coder.fit_transform (X_train.business_code)