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[英]Pandas update and add rows one dataframe with key column in another dataframe
[英]Update column of a dataframe when key matches from another dataframe in pandas
刪除列final
,使用帶indicator
參數的左連接,因此可以通過比較both
來映射True, False
創建1,0
列:
df = df2.drop('final', axis=1).merge(df1, how='left', indicator='final')
df['final'] = df['final'].eq('both').astype(int)
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