DataFrame中的value_counts返回浮点数

import pandas as pd

# 创建一个DataFrame对象
data = {'A': ['foo', 'bar', 'foo', 'bar', 'foo', 'bar', 'foo', 'foo'],
        'B': ['one', 'one', 'two', 'two', 'two', 'one', 'two', 'one']}
df = pd.DataFrame(data)

# 使用value_counts方法统计'A'列中各个值的频率
counts = df['A'].value_counts()
print(counts)

foo    5
bar    3
Name: A, dtype: int64