如何有条件地更新Pandas中的DataFrame列 [英] How to conditionally update DataFrame column in Pandas

问题描述

使用此DataFrame，当line_race等于零时，如何有条件地将rating设置为0?

With this DataFrame, how can I conditionally set rating to 0 when line_race is equal to zero?

    line_track  line_race  rating foreign
 25        MTH         10     84    False
 26        MTH          6     88    False
 27        TAM          5     87    False
 28         GP          2     86    False
 29         GP          7     59    False
 30        LCH          0    103     True
 31        LEO          0    125     True
 32        YOR          0    126     True
 33        ASC          0    124     True

换句话说，在DataFrame上说ColumnA = x然后ColumnB = y否则ColumnB = ColumnB的正确方法是什么

In other words, what is the proper way on a DataFrame to say if ColumnA = x then ColumnB = y else ColumnB = ColumnB

推荐答案

df.loc[df['line_race'] == 0, 'rating'] = 0

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