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              用最簡單的語言解釋Python的閉包是什么?

              Python中的閉包不是一個一說就能明白的概念,但是隨著你往學習的深入,無論如何你都需要去了解這么一個東西。

              閉包的概念

              我們嘗試從概念上去理解一下閉包。

              在一些語言中,在函數中可以(嵌套)定義另一個函數時,如果內部的函數引用了外部的函數的變量,則可能產生閉包。閉包可以用來在一個函數與一組“私有”變量之間創建關聯關系。在給定函數被多次調用的過程中,這些私有變量能夠保持其持久性。—— 維基百科

              用比較容易懂的人話說,就是當某個函數被當成對象返回時,夾帶了外部變量,就形成了一個閉包。看例子。

              def make_printer(msg): ? ?def printer(): ? ? ? ?print msg ?# 夾帶私貨(外部變量) ? ?return printer ?# 返回的是函數,帶私貨的函數printer = make_printer('Foo!')printer()

              支持將函數當成對象使用的編程語言,一般都支持閉包。比如Python, JavaScript。

              如何理解閉包

              閉包存在有什么意義呢?為什么需要閉包?

              我個人認為,閉包存在的意義就是它夾帶了外部變量(私貨),如果它不夾帶私貨,它和普通的函數就沒有任何區別。同一個的函數夾帶了不同的私貨,就實現了不同的功能。其實你也可以這么理解,閉包和面向接口編程的概念很像,可以把閉包理解成輕量級的接口封裝。

              接口定義了一套對方法簽名的約束規則。

              def tag(tag_name): ? ?def add_tag(content): ? ? ? ?return "<{0}>{1}</{0}>".format(tag_name, content) ? ?return add_tag ? ?content = 'Hello'add_tag = tag('a')print add_tag(content)# <a>Hello</a>add_tag = tag('b')print add_tag(content)# <b>Hello</b>

              在這個例子里,我們想要一個給contenttag的功能,但是具體的tag_name是什么樣子的要根據實際需求來定,對外部調用的接口已經確定,就是add_tag(content)。如果按照面向接口方式實現,我們會先把add_tag寫成接口,指定其參數和返回類型,然后分別去實現a和b的add_tag

              但是在閉包的概念中,add_tag就是一個函數,它需要tag_namecontent兩個參數,只不過tag_name這個參數是打包帶走的。所以一開始時就可以告訴我怎么打包,然后帶走就行。

              上面的例子不太生動,其實在我們生活和工作中,閉包的概念也很常見。比如說手機撥號,你只關心電話打給誰,而不會去糾結每個品牌的手機是怎么實現的,用到了哪些模塊。再比如去餐館吃飯,你只要付錢就可以享受到服務,你并不知道那桌飯菜用了多少地溝油。這些都可以看成閉包,返回來的是一些功能或者服務(打電話,用餐),但是這些功能使用了外部變量(天線,地溝油等等)。

              你也可以把一個類實例看成閉包,當你在構造這個類時,使用了不同的參數,這些參數就是閉包里的包,這個類對外提供的方法就是閉包的功能。但是類遠遠大于閉包,因為閉包只是一個可以執行的函數,但是類實例則有可能提供很多方法。

              何時使用閉包

              其實閉包在Python中很常見,只不過你沒特別注意這就是一個閉包。比如Python中的裝飾器Decorator,假如你需要寫一個帶參數的裝飾器,那么一般都會生成閉包。

              為什么?因為Python的裝飾器是一個固定的函數接口。它要求你的裝飾器函數(或裝飾器類)必須返回這樣一種接口,接受一個函數并返回一個函數:

              # how to definedef wrapper(func1): ?# 必須接受一個且僅一個函數作為參數 ? ?return func2 ?# 返回一個且僅一個callable對象,一般為函數# how to usedef target_func(args): # 目標函數 ? ?pass# 調用方式一,直接包裹result = wrapper(target_func)(args)# 調用方式二,使用@語法,等同于方式一@wrapperdef target_func(args): ? ?passresult = target_func()

              那么如果你的裝飾器如果帶參數呢?那么你就需要在原來的裝飾器上再包一層,用于接收這些參數。這些參數(私貨)傳遞到內層的裝飾器里后,閉包就形成了。所以說當你的裝飾器需要自定義參數時,一般都會形成閉包。(類裝飾器例外)

              def html_tags(tag_name): ? ?def wrapper_(func): ? ? ? ?def wrapper(*args, **kwargs): ? ? ? ? ? ?content = func(*args, **kwargs) ? ? ? ? ? ?return "<{tag}>{content}</{tag}>".format(tag=tag_name, content=content) ? ? ? ?return wrapper ? ?return wrapper_@html_tags('b')def hello(name='Toby'): ? ?return 'Hello {}!'.format(name)# 不用@的寫法如下# hello = html_tag('b')(hello)# html_tag('b') 是一個閉包,它接受一個函數,并返回一個函數print hello() ?# <b>Hello Toby!</b>print hello('world') ?# <b>Hello world!</b>

              再深入一點

              其實也不必太深入,理解這上面的概念,很多看起來頭疼的代碼也不過如此。

              下面讓我們來了解一下閉包的包到底長什么樣子。其實閉包函數相對與普通函數會多出一個__closure__的屬性,里面定義了一個元組用于存放所有的cell對象,每個cell對象一一保存了這個閉包中所有的外部變量。

              >>> def make_printer(msg1, msg2): ? ?def printer(): ? ? ? ?print msg1, msg2 ? ?return printer>>> printer = make_printer('Foo', 'Bar') ?# 形成閉包>>> printer.__closure__ ? # 返回cell元組(<cell at 0x03A10930: str object at 0x039DA218>, <cell at 0x03A10910: str object at 0x039DA488>)>>> printer.__closure__[0].cell_contents ?# 第一個外部變量'Foo'>>> printer.__closure__[1].cell_contents ?# 第二個外部變量'Bar'

              原理就是這么簡單。

              參考鏈接

              • https://www.the5fire.com/closure-in-python.html
              • http://stackoverflow.com/questions/4020419/why-arent-python-nested-functions-called-closures

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