从今天到"n“周之前的Pandas数据帧中提取数据块

import pandas as pd

data = {'Name': ['John', 'Emma', 'Luke', 'Olivia'],
        'Age': [25, 28, 22, 30],
        'City': ['New York', 'Paris', 'London', 'Tokyo']}
df = pd.DataFrame(data)

    Name  Age       City
0   John   25   New York
1   Emma   28      Paris
2   Luke   22     London
3  Olivia  30      Tokyo

block = df.iloc[1:3]

   Name  Age    City
1  Emma   28   Paris
2  Luke   22  London