pandas 如何在python panda中根据条件添加列

f45qwnt8 于 2022-12-02 发布在 Python

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I have two dataframes where i want to append two columns based on a condition.
I have the two following dataframes:

I want to add TS%_mean and TS%_SD to the other data if the year matches to the first DataFrame so that each player has their mean and standard deviation for that year.
I have tried to itterate through a loop and having some conditions for the addition of columns. Everything I have tried does not work as intended unfourtunately.

来源：https://stackoverflow.com/questions/74627229/how-to-add-a-column-based-on-condition-in-python-pandas

1条答案

按热度按时间

假设您有df和df2，则可以使用merge。

df.merge(df2, on = 'Year')

您可能还需要学习joins。虽然链接是基于SQL的，但您将学习连接表的基础知识，以便创建更复杂的连接。

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