如何返回只有key + value回文的字典

def is_palindrome(s):
    # 判断字符串是否是回文
    return s == s[::-1]

def get_palindrome_dict(dictionary):
    # 返回只有key + value回文的字典
    palindrome_dict = {}
    for key, value in dictionary.items():
        if key == value and is_palindrome(key):
            palindrome_dict[key] = value
    return palindrome_dict

# 示例字典
example_dict = {
    "level": "level",
    "racecar": "racecar",
    "hello": "world",
    "abc": "cba"
}

# 调用函数获取只有key + value回文的字典
result_dict = get_palindrome_dict(example_dict)

# 打印结果
print(result_dict)

{'level': 'level', 'racecar': 'racecar'}