Python入门5（pandas中merge中的参数how）

Posted 2020-10-16 yuanninesuns

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 1 import pandas as pd
 2 df1 = pd.DataFrame([[1,2,3],[1,10,20],[5,6,7],[3,9,0],[8,0,3]],columns=[\'x1\',\'x2\',\'x3\'])
 3 df2 = pd.DataFrame([[1,2],[1,10],[1,3],[4,6],[3,9]],columns=[\'x1\',\'x4\'])
 4 print (df1)
 5 print (df2)
 6 df3 = pd.merge(df1,df2,how = \'left\',on=\'x1\')
 7 print (df3)
 8 df4 = pd.merge(df1,df2,how = \'right\',on=\'x1\')
 9 print (df4)
10 df5 = pd.merge(df1,df2,how = \'inner\',on=\'x1\')
11 print (df5)
12 df6 = pd.merge(df1,df2,how = \'outer\',on=\'x1\')
13 print (df6)