Question

我正在通过以下示例学习“流利的python”之后的装饰器：

registry = []

def register(func):
    print("running register(%s)" % func)
    registry.append(func)
    return func

@register
def f1():
    print("runnning f1()")

@register
def f2():
    print("running f2()")

def f3():
    print("running f3()")

def main():
    print("running main()")
    print("registry ->", registry)
    f1()
    f2()
    f3()

if __name__ == "__main__":
    main()

运行它并通过：

running register(<function f1 at 0x10870ab70>)
running register(<function f2 at 0x1086f58c8>)
running main()
registry -> [<function f1 at 0x10870ab70>, <function f2 at 0x1086f58c8>]
runnning f1()
running f2()
running f3()

然后，我将寄存器的返回结果从return func更改为返回func()

def register(func):
    print("running register(%s)" % func)
    registry.append(func)
    return func()

运行并获取

running register(<function f1 at 0x108753d08>)
runnning f1()
running register(<function f2 at 0x108753488>)
running f2()
running main()
registry -> [<function f1 at 0x108753d08>, <function f2 at 0x108753488>]

我不能确定两者之间的区别。

在装饰器中返回func或func（）

0 个答案: