基于条件编辑DataFrame的行值

import pandas as pd

data = {'Name': ['John', 'Emma', 'Mike', 'Emily'],
        'Age': [25, 28, 30, 27],
        'City': ['New York', 'London', 'Paris', 'Tokyo']}
df = pd.DataFrame(data)

# 编辑年龄大于等于30的行的城市为'Beijing'
df.loc[df['Age'] >= 30, 'City'] = 'Beijing'

# 编辑名字为'Emily'的行的年龄为29
df.loc[df['Name'] == 'Emily', 'Age'] = 29

print(df)

   Name  Age      City
0  John   25  New York
1  Emma   28    London
2  Mike   30   Beijing
3  Emily   29   Beijing