如何基于pandas中的特定列值向列中添加值

import pandas as pd

data = {'Name': ['Tom', 'Nick', 'John', 'Sam'],
        'Age': [20, 21, 19, 22],
        'City': ['New York', 'Paris', 'London', 'Tokyo']}
df = pd.DataFrame(data)

selected_rows = df[df['City'] == 'Paris']

selected_rows['New Column'] = 'Value'

import pandas as pd

data = {'Name': ['Tom', 'Nick', 'John', 'Sam'],
        'Age': [20, 21, 19, 22],
        'City': ['New York', 'Paris', 'London', 'Tokyo']}
df = pd.DataFrame(data)

selected_rows = df[df['City'] == 'Paris']
selected_rows['New Column'] = 'Value'

print(selected_rows)