计数pandas数据帧中的匹配组合

import pandas as pd

# 创建一个示例数据帧
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]}
df = pd.DataFrame(data)

# 使用groupby和count方法计数匹配组合
count_df = df.groupby(['A', 'B']).count()

print(count_df)

         C
A   B     
bar one  2
    two  1
foo one  2
    two  2