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                ## 裝飾器 * [參考](https://www.liaoxuefeng.com/wiki/001374738125095c955c1e6d8bb493182103fac9270762a000/001386819879946007bbf6ad052463ab18034f0254bf355000) >[info] #### 獲取函數名稱 * 函數對象有一個__name__屬性,可以拿到函數的名字: ~~~ >>> now.__name__ 'now' >>> f.__name__ 'now' ~~~ >[info] #### 打印日志 ~~~ def log(func): def wrapper(*args, **kw): print 'call %s():' % func.__name__ return func(*args, **kw) return wrapper ~~~ ~~~ @log def now(): print '2013-12-25' ~~~ ~~~ >>> now() call now(): 2013-12-25 把@log放到now()函數的定義處,相當于執行了語句: now = log(now) ~~~ >[info] 高級的日志 ~~~ def log(text): def decorator(func): def wrapper(*args, **kw): print '%s %s():' % (text, func.__name__) return func(*args, **kw) return wrapper return decorator ~~~ ~~~ @log('execute') def now(): print '2013-12-25' 和兩層嵌套的decorator相比,3層嵌套的效果是這樣的: >>> now = log('execute')(now) ~~~ ~~~ import functools def log(text): def decorator(func): @functools.wraps(func) def wrapper(*args, **kw): print '%s %s():' % (text, func.__name__) return func(*args, **kw) return wrapper return decorator ~~~
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