如何在Python中对我的Dataframe的每一列进行ADF测试？

import pandas as pd
from statsmodels.tsa.stattools import adfuller

# 创建一个示例Dataframe
data = {'col1': [1, 2, 3, 4, 5],
        'col2': [6, 7, 8, 9, 10],
        'col3': [11, 12, 13, 14, 15]}
df = pd.DataFrame(data)

# 对每一列进行ADF测试
for column in df.columns:
    result = adfuller(df[column])
    print(f"Column: {column}")
    print(f"ADF Statistic: {result[0]}")
    print(f"p-value: {result[1]}")
    print(f"Critical Values: {result[4]}")
    print("------------------------")