Python：如何用元组中的列名重命名 dataframe？

Question

I have the dataframe below

   Col1/sum/mean     Col2/sum/mean   Col3/sum/mean
A      1                   2                3
B      4                   5                6
C      7                   8                9

I find it annoying to access the column by doing df[('Col1','sum','mean')] everytime, is there a way to remove the sum and mean levels? Or rename it?

Answer 1

If there are tuples select first value of tuple:

df.columns = [x[0] for x in df.columns]

If no tuples use str.split with selecting first value:

df.columns = df.columns.str.split('/').str[0]
print (df)
   Col1  Col2  Col3
A     1     2     3
B     4     5     6
C     7     8     9