如何在Pandas Dataframe Python中按列对每3行求和

import pandas as pd

# 创建一个示例DataFrame
data = {'A': [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]}
df = pd.DataFrame(data)

# 使用rolling函数和sum函数按列对每3行求和
result = df['A'].rolling(3).sum()

# 打印结果
print(result)

0     NaN
1     NaN
2     6.0
3     9.0
4    12.0
5    15.0
6    18.0
7    21.0
8    24.0
9    27.0
Name: A, dtype: float64