如何在Pandas中返回值的计数

import pandas as pd

# 创建一个Series对象
data = pd.Series([1, 2, 2, 3, 3, 3, 4, 4, 4, 4])

# 返回值的计数
counts = data.value_counts()
print(counts)

4    4
3    3
2    2
1    1
dtype: int64

import pandas as pd

# 创建一个DataFrame对象
data = pd.DataFrame({'A': [1, 2, 3, 4, 5],
                     'B': [1, 1, 2, 2, 2],
                     'C': [1, 1, 1, 2, 2]})

# 返回单个列的计数
counts_A = data['A'].value_counts()
print(counts_A)

# 返回多个列的计数
counts_AB = data[['A', 'B']].value_counts()
print(counts_AB)

5    1
4    1
3    1
2    1
1    1
Name: A, dtype: int64

A  B
5  2    1
4  2    1
3  2    1
2  1    1
1  1    1
dtype: int64