大家好，又见面了，我是你们的朋友全栈君。
test1=pd.DataFrame(np.random.randn(2,2),columns=[‘1′,’2’])
test1
test2=pd.DataFrame(np.random.randn(4,2),columns=[‘1′,’sss’])
test2
test3=pd.concat([test1,test2])
test3
test4=pd.concat([test1,test2],axis=1)
test4
结果
test3
Out[9]:
1 2 sss
0 -0.683598 0.413969 NaN
1 0.304602 -1.875766 NaN
0 -0.964264 NaN 1.298050
1 -0.647045 NaN -0.555425
2 0.620427 NaN 0.813048
3 2.056769 NaN 0.026650
test4=pd.concat([test1,test2],axis=1)
test4
Out[11]:
1 2 1 sss
0 -0.683598 0.413969 -0.964264 1.298050
1 0.304602 -1.875766 -0.647045 -0.555425
2 NaN NaN 0.620427 0.813048
3 NaN NaN 2.056769 0.026650
默认concat不会产生重复列 推荐使用
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