英文文檔：

callable(object)

Return True if the object argument appears callable, False if not. If this returns true, it is still possible that a call fails, but if it is false, calling object will never succeed. Note that classes are callable (calling a class returns a new instance); instances are callable if their class has a __call__() method.

檢測(cè)對(duì)象是否可被調(diào)用

說明：

1. 方法用來檢測(cè)對(duì)象是否可被調(diào)用，可被調(diào)用指的是對(duì)象能否使用()括號(hào)的方法調(diào)用。

>>> callable(callable)True>>> callable(1)False>>> 1()Traceback (most recent call last):File '<pyshell#5>', line 1, in <module>1()TypeError: ’int’ object is not callable>>>

2. 可調(diào)用對(duì)象，在實(shí)際調(diào)用也可能調(diào)用失敗；但是不可調(diào)用對(duì)象，調(diào)用肯定不成功。

3. 類對(duì)象都是可被調(diào)用對(duì)象，類的實(shí)例對(duì)象是否可調(diào)用對(duì)象，取決于類是否定義了__call__方法。

>>> class A: #定義類A pass>>> callable(A) #類A是可調(diào)用對(duì)象True>>> a = A() #調(diào)用類A>>> callable(a) #實(shí)例a不可調(diào)用False>>> a() #調(diào)用實(shí)例a失敗Traceback (most recent call last): File '<pyshell#31>', line 1, in <module> a()TypeError: ’A’ object is not callable>>> class B: #定義類B def __call__(self): print(’instances are callable now.’) >>> callable(B) #類B是可調(diào)用對(duì)象True>>> b = B() #調(diào)用類B>>> callable(b) #實(shí)例b是可調(diào)用對(duì)象True>>> b() #調(diào)用實(shí)例b成功instances are callable now.

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