在一个装饰器中处理不同类型的返回值

import functools

def handle_return_values(func):
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        result = func(*args, **kwargs)
        
        if isinstance(result, int):
            print(f"Received an integer: {result}")
        elif isinstance(result, str):
            print(f"Received a string: {result}")
        elif isinstance(result, list):
            print(f"Received a list: {result}")
        else:
            print(f"Received an unknown type: {type(result)}")
        
        return result
    
    return wrapper

@handle_return_values
def example_function(value):
    if value == 1:
        return 42
    elif value == 2:
        return "hello"
    elif value == 3:
        return [1, 2, 3]
    else:
        return {"key": "value"}

# 测试示例函数
example_function(1)
example_function(2)
example_function(3)
example_function(4)