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发现一个问题

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叫小小兽

#1 Created at ... [Delete] [Delete and Lock User] 
def log(func):
    def warpper(x, y):
        print("call %s():" % func.__name__)
        func(x, y)
    return warpper

@logdef add_num(x, y):
    return x + y

print(add_num(10, 20))

使用装饰器之后，原来的函数return的值为什么变成了None？

call add_num():
None

Sunshine死胖

#2 Created at ... [Delete] [Delete and Lock User] 
def warpper(x, y):
        print("call %s():" % func.__name__)
        func(x, y)

这里没有返回值，默认返回None

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