SettingWithCopyWarning:A value is trying to be set on a copy of a slice from a DataFrame. - 代码天地

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

其他 2020-04-11 09:49:32 阅读次数: 0

问题描述

df['new_column'] = df['old_column']

上述命令导致如题问题。
解决方案

涉及Python底层数据处理，关键字： __getitem__ 、 chained indexing 。

简单来讲的话，尽量用df.loc[行名, 列名] = 值方式赋值，不采用df[][]方式赋值。
Reference

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

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

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

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