如何解决SettingWithCopyWarning: in using pandas 的警告信息
在使用 pandas 更新数据框时，我收到以下警告消息。我不清楚这些警告消息表明什么？提供的链接讨论了链索引，我不确定这与这些代码段有什么关系。
df_train.fillna(df_train.mean(),inplace=True)
C:\Users\Anaconda3\envs\tensorflow\lib\site-packages\pandas\core\series.py:4523: SettingWithcopyWarning:
A value is trying to be set on a copy of a slice from a DataFrame
See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy
downcast=downcast,for column in columns_to_delete:
df_train.drop(column,axis=1,inplace=True)
C:\Users\Anaconda3\envs\tensorflow\lib\site-packages\pandas\core\frame.py:4170: SettingWithcopyWarning:
A value is trying to be set on a copy of a slice from a DataFrame
See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy
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