我有一个Pandas DataFrame,我想使用以下代码更改一列中的所有值:
df["Population"] = round(df["Population"]/1000000,1)
我收到了以下警告:
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
return super().rename(
<ipython-input-6-59bf041bb022>:2: SettingWithCopyWarning:
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: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy
df["Population"] = round(df["Population"]/1000000,1)
如何正确完成并避免此类警告?
感谢您的帮助!