如何从groupby()产生的group中删除列？

import pandas as pd

# 创建一个示例数据集
data = {'A': ['foo', 'bar', 'foo', 'bar', 'foo', 'bar', 'foo', 'foo'],
        'B': ['one', 'one', 'two', 'two', 'two', 'one', 'two', 'one'],
        'C': [1, 2, 3, 4, 5, 6, 7, 8],
        'D': [10, 20, 30, 40, 50, 60, 70, 80]}

df = pd.DataFrame(data)

# 按照列'A'进行分组
groups = df.groupby('A')

# 获取分组'foo'的数据
group_foo = groups.get_group('foo')

# 删除列'C'
group_foo = group_foo.drop('C', axis=1)

print(group_foo)

     A    B   D
0  foo  one  10
2  foo  two  30
4  foo  two  50
6  foo  two  70
7  foo  one  80