from time import ctime, sleep

def tsfunc(func):
    def wrappedFunc():
        print(‘[%s] %s() classed‘ % (ctime(),func.__name__))
        print("先執行裝飾器")
        return func()
    print("this is tsfunc")
    return wrappedFunc

@tsfunc
def foo():
    print("this is foo")

@tsfunc
 
def foo2():
    print("this is foo2")




foo();
foo2();

運行結果

this is tsfunc
this is tsfunc
[Fri Dec 29 20:48:34 2017] foo() classed
先執行裝飾器
this is foo
[Fri Dec 29 20:48:34 2017] foo2() classed
先執行裝飾器
this is foo2
[Finished in 0.2s]

調用foo()以後，

裝飾器中的語句先執行了。

然後開始調用內部函數，執行內部函數的語句

然後開始執行被裝飾函數的語句

Python裝飾函數