AttributeError：“Function”对象没有属性。无法调用另一个函数的属性

def add_attribute(attr_name, attr_value):
    def decorator(func):
        setattr(func, attr_name, attr_value)
        return func
    return decorator

@add_attribute('description', 'This function adds two numbers.')
def add(a, b):
    return a + b

print(add(1, 2))  # 输出: 3
print(add.description)  # 输出: This function adds two numbers.

class Calculator:
    def __init__(self, description):
        self.description = description

    def add(self, a, b):
        return a + b

calc = Calculator('This method adds two numbers.')
print(calc.add(1, 2))  # 输出: 3
print(calc.description)  # 输出: This method adds two numbers.

def create_function_with_attribute(attr_name, attr_value):
    def function_with_attribute(a, b):
        return a + b
    setattr(function_with_attribute, attr_name, attr_value)
    return function_with_attribute

add = create_function_with_attribute('description', 'This function adds two numbers.')
print(add(1, 2))  # 输出: 3
print(add.description)  # 输出: This function adds two numbers.