从dataframe中选择特定行并重新构造变量(Python)

import pandas as pd

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

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

print(new_df)

import pandas as pd

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

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

print(new_df)