熊猫：这是什么样的联盟？还是加入？

Question

我正在尝试用B更新df A以生成C.

A =

Name   city 
bob    a
adam   b
mike   c
fred   d

B =

Name   city
adam   e
mike   f

C =

Name   city
bob    a
adam   e
mike   f
fred   d

也许没有必要加入？

Answer 1

B.set_index('Name').combine_first(A.set_index('Name')).reset_index()
Out: 
   Name city
0  adam    e
1   bob    a
2  fred    d
3  mike    f