如何为Pandas的列中的每个元素指定一个列表（或系列）？

Question

如何将temp_list分配给“PLAYERS”列中的每个元素？

temp_list =['a','b'] 

    DATE   COUNTRY COUNTRY_ID COUNT PLAYERS 
0 1980 United States   840  42  0 
1 1980 Czech Republic   203  2  0 
2 1980  New Zealand   554  3  0 
3 1980   Italy   380  4  0 
4 1980  Paraguay   600  2  0 
5 1980   Brazil   76  3  0 
6 1980   Chile   152  2  0 

Answer 1

创建一个长度与dataframe长度相同的列表的列表并分配它？

In [685]: df['PLAYERS'] = [temp_list] * len(df.index) 

In [686]: df 
Out[686]: 
    DATE   COUNTRY COUNTRY_ID COUNT PLAYERS 
0 1980 United States   840  42 [a, b] 
1 1980 Czech Republic   203  2 [a, b] 
2 1980  New Zealand   554  3 [a, b] 
3 1980   Italy   380  4 [a, b] 
4 1980  Paraguay   600  2 [a, b] 
5 1980   Brazil   76  3 [a, b] 
6 1980   Chile   152  2 [a, b]