數據幀，從列表中設置索引

Question

從列表中創建數據幀時可以將索引設置爲其中一個值嗎？

import pandas as pd 

tmp = [['a', 'a1'], ['b',' b1']] 

df = pd.DataFrame(tmp, columns=["First", "Second"]) 

     First Second 
0   a a1 
1   b b1 

，我想怎麼看：

 First Second 
a   a a1 
b   b b1 

Answer 1

>>> pd.DataFrame(tmp, columns=["First", "Second"]).set_index('First', drop=False) 
     First Second 
First    
a   a  a1 
b   b  b1 

Answer 2

如果你不希望指數名稱：

df = pd.DataFrame(tmp, columns=["First", "Second"], index=[i[0] for i in tmp]) 

結果：

First Second 
a  a  a1 
b  b  b1