通过在 Python 中使用循环连接另一个 dataframe 的值来重命名一个 dataframe 的变量

Question

I have two dataframe. The first dataframe has the directions

df1

   Direction 
0  sb
1  nb
2  wb
3  eb

The second df2 is

   LT Thr RT UT LT.1 Thr.1 RT.1 UT.1 LT.2 Thr.2 RT.2 UT.2
0  
1
2
3

I want to be able to loop through the names of df2 and rename them by concatenating using the direction df as follows:

df2

   sb_LT sb_Thr sb_RT sb_UT nb_LT nb_Thr nb_RT nb_UT wb_LT wb_Thr wb_RT wb_UT
0  
1
2
3

Is this possible?

Answer 1

You can try

new_columns = [df1.iloc[1,0]+"_"+x.split(".")[0] if '1' in x else 
               df1.iloc[2,0]+"_"+x.split(".")[0] if '2' in x else 
               df1.iloc[3,0]+"_"+x.split(".")[0] if '3' in x else 
               df1.iloc[0,0]+"_"+x.split(".")[0] for x in df2]

df2.columns = new_columns