Python-dataframe合併(merge函數）

import pandas as pd import numpy as np df1=pd.DataFrame({'key':['b','b','a','c','a','a','b'],'data1':range(7)}) df2=pd.DataFrame({'key':['a','b','d'], 'data2':range(3)}) pd.merge(df1,df2) #沒有指明聯結的建，會

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