从列表中的数据框中按值选择行，以分配新值r

import pandas as pd
import numpy as np

data = {'Name': ['John', 'Emma', 'Ryan', 'Emily'],
        'Age': [25, 30, 35, 40],
        'City': ['New York', 'London', 'Paris', 'Tokyo']}
df = pd.DataFrame(data)

selected_rows = df[df['Age'] > 30]

selected_rows.loc[selected_rows['City'] == 'London', 'Age'] = 32

import pandas as pd
import numpy as np

data = {'Name': ['John', 'Emma', 'Ryan', 'Emily'],
        'Age': [25, 30, 35, 40],
        'City': ['New York', 'London', 'Paris', 'Tokyo']}
df = pd.DataFrame(data)

selected_rows = df[df['Age'] > 30]
selected_rows.loc[selected_rows['City'] == 'London', 'Age'] = 32

print(selected_rows)