如何使用嵌套字典遍历url？

def traverse_url(url_dict, prefix=""):
    for key, value in url_dict.items():
        if isinstance(value, dict):
            traverse_url(value, prefix + key + '/')
        else:
            print(prefix + key + ': ' + value)

# 示例嵌套字典
url_dict = {
    'www': {
        'google': {
            'com': 'Google',
            'cn': '谷歌'
        },
        'baidu': {
            'com': 'Baidu',
            'cn': '百度'
        }
    },
    'blog': {
        'medium': {
            'com': 'Medium',
            'cn': '简书'
        },
        'wordpress': {
            'com': 'WordPress',
            'cn': 'WordPress'
        }
    }
}

# 调用函数进行遍历
traverse_url(url_dict)

www/google/com: Google
www/google/cn: 谷歌
www/baidu/com: Baidu
www/baidu/cn: 百度
blog/medium/com: Medium
blog/medium/cn: 简书
blog/wordpress/com: WordPress
blog/wordpress/cn: WordPress