DataFrame，如何向多索引列pandas添加列

import pandas as pd

# 创建一个多索引列的 DataFrame
arrays = [
    ['A', 'A', 'B', 'B'],
    ['one', 'two', 'one', 'two']
]
index = pd.MultiIndex.from_arrays(arrays, names=('first', 'second'))
df = pd.DataFrame({'value': [10, 20, 30, 40]}, index=index)

print("原始 DataFrame:")
print(df)

# 向多索引列添加新列
new_column_data = [50, 60, 70, 80]
df['new_column'] = new_column_data

print("\n添加新列后的 DataFrame:")
print(df)

原始 DataFrame:
              value
first second       
A     one       10
       two       20
B     one       30
       two       40

添加新列后的 DataFrame:
              value  new_column
first second                  
A     one       10         50
       two       20         60
B     one       30         70
       two       40         80

# 确保新列的长度与 DataFrame 的行数匹配
new_column_data = [50, 60, 70, 80]
if len(new_column_data) == len(df):
    df['new_column'] = new_column_data
else:
    print("新列的长度与 DataFrame 的行数不匹配")