使用pandas设置具有特定条件的每行的列值

import pandas as pd

data = {'Name': ['John', 'Emma', 'Mike', 'Emily'],
        'Age': [25, 28, 30, 22],
        'Gender': ['Male', 'Female', 'Male', 'Female']}
df = pd.DataFrame(data)

condition = df['Age'] > 25

df.loc[condition, 'Gender'] = 'Unknown'

import pandas as pd

data = {'Name': ['John', 'Emma', 'Mike', 'Emily'],
        'Age': [25, 28, 30, 22],
        'Gender': ['Male', 'Female', 'Male', 'Female']}
df = pd.DataFrame(data)

condition = df['Age'] > 25
df.loc[condition, 'Gender'] = 'Unknown'

print(df)

   Name  Age  Gender
0  John   25    Male
1  Emma   28    Male
2  Mike   30  Unknown
3  Emily   22  Female