Pandas:根据以前未知数量的条件赋值

import pandas as pd

# 创建一个DataFrame
data = {'Name': ['Tom', 'Nick', 'John', 'Alice'],
        'Age': [20, 25, 30, 35],
        'Gender': ['M', 'M', 'M', 'F']}
df = pd.DataFrame(data)

# 根据条件赋值
df.loc[df['Age'] > 25, 'Category'] = 'Senior'
df.loc[df['Age'] <= 25, 'Category'] = 'Junior'

# 打印结果
print(df)

   Name  Age Gender Category
0   Tom   20      M   Junior
1  Nick   25      M   Junior
2  John   30      M   Senior
3 Alice   35      F   Senior