条件函数应用于pandas数据帧，如果与else比较，则更改值

import pandas as pd
import numpy as np

df = pd.DataFrame({'A': [1, 2, 3, 4, 5],
                   'B': [6, 7, 8, 9, 10]})

def condition_func(x):
    if x > 3:
        return 'High'
    else:
        return 'Low'

df['C'] = df['A'].apply(condition_func)

df = df.applymap(condition_func)

df['D'] = np.where(df['A'] > df['B'], 'True', 'False')