Python 如何根据另一个行字符串重命名行字符串

假设我有这样一个数据帧:

import pandas as pd
df = pd.DataFrame({"a":["","DATE","01-01-2012"],
                   "b":["","ID",18],
                   "c":["CLASS A","GOLF",3],
                   "d":["","HOCKEY",4],
                   "e":["","BASEBALL",2],
                   "f":["CLASS B","GOLF",15],
                   "g":["","HOCKEY",2],
                   "h":["","BASEBALL",3]
                   })

Out[33]: 
            a   b        c       d         e        f       g         h
0                  CLASS A                    CLASS B                  
1        DATE  ID     GOLF  HOCKEY  BASEBALL     GOLF  HOCKEY  BASEBALL
2  01-01-2012  18        3       4         2       15       2         3

我想将第一行的字符串添加到下面一行的运动名称中，但只能在下一节课开始之前添加.有人知道我怎么能做到这一点吗？

所以结果应该是这样的:

            a   b             c  ...             f               g                 h
0                       CLASS A  ...       CLASS B                                  
1        DATE  ID  CLASS A GOLF  ...  CLASS B GOLF  CLASS B HOCKEY  CLASS B BASEBALL
2  01-01-2012  18             3  ...            15               2                 3

稍后我会将第1行作为我的标题名，但这部分我知道怎么做.我已经try 使用df.iterrow，但我对工作流程感到困惑.