如何在python中解码base64 url​​？

import base64

def decode_base64_url(base64_url):
    # 将Base64 URL编码的字符串转换为字节流
    base64_bytes = base64_url.encode('utf-8')
    
    # 使用urlsafe_b64decode()函数解码Base64 URL编码的字符串
    decoded_bytes = base64.urlsafe_b64decode(base64_bytes)
    
    # 将解码后的字节流转换为字符串
    decoded_string = decoded_bytes.decode('utf-8')
    
    return decoded_string

# 示例用法
base64_url = 'SGVsbG8gV29ybGQh'
decoded_string = decode_base64_url(base64_url)
print(decoded_string)

Hello World!