在Pandas中创建多索引头

import pandas as pd

data = {'A': [1, 2, 3, 4],
        'B': [5, 6, 7, 8],
        'C': [9, 10, 11, 12],
        'D': [13, 14, 15, 16]}
df = pd.DataFrame(data)

headers = pd.MultiIndex.from_tuples([('Group 1', 'A'), ('Group 1', 'B'), ('Group 2', 'C'), ('Group 2', 'D')])
df.columns = headers

print(df[('Group 1', 'A')])

0    1
1    2
2    3
3    4
Name: (Group 1, A), dtype: int64