Pandas SettingWithCopyWarning:试图在 DataFrame 的切片副本上设置值 [英] Pandas SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame

问题描述

我在以下情况下不断收到该主题的警告:

I keep getting the warning in the subject in the following situations:

1. df.rename(columns={'one':'one_a'}, inplace=True)

1. df.rename(columns={'one':'one_a'}, inplace=True)

df.drop(['one', 'two', 'three'], axis=1, inplace=True)

df.drop(['one', 'two', 'three'], axis=1, inplace=True)

我该如何解决?

推荐答案

最简单的修复(可能也是良好的编程实践)是不进行就地操作，例如

Easiest fix (and probably good programming practice) would be to not do inplace operations, e.g.

df2 = df.rename(columns={'one':'one_a'})

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