如何在导出到DataFrame文件之前设置Python中多行的样式

import pandas as pd

data = {'Name': ['John', 'Emma', 'Michael'],
        'Age': [25, 30, 35],
        'City': ['New York', 'London', 'Paris']}
df = pd.DataFrame(data)

def set_style(row):
    if row['Age'] < 30:
        return ['background-color: lightgreen'] * len(row)
    elif row['Age'] > 30:
        return ['background-color: lightblue'] * len(row)
    else:
        return ['background-color: yellow'] * len(row)

styled_df = df.style.apply(set_style, axis=1)

styled_df.to_excel('styled_dataframe.xlsx', index=False)
styled_df.to_csv('styled_dataframe.csv', index=False)