w8484855@qq.com 发表于 2017-9-4 20:03:26

Python中callable函数如何使用?

本文和大家分享的主要是python中使用callable函数相关内容,一起来看看吧,希望对大家学习python有所帮助。  可以通过下面的例子来学习一下什么样的对象是可以调用的:  # File: builtin-callable-example-1.py  def dump(function):  if callable(function):  print(function, "is callable")  else:  print(function, "is *not* callable")  class A:  def method(self, value):  return value  class B(A):  def __call__(self, value):  return value  a = A()  b = B()  dump(0) # simple objects  dump("string")  dump(callable)  dump(dump) # function  dump(A) # classes  dump(B)  dump(B.method)  dump(a) # instances  dump(b)  dump(b.method)  输出结果如下:  == RESTART: D:/work/csdn/python_Game1/example/builtin-callable-example-1.py ==  0 is *not* callable  string is *not* callable  is callable  is callable  is callable  is callable  is callable  <__main__.a object="" at="" 0x0000021fde6f22b0="">is *not* callable  <__main__.b object="" at="" 0x0000021fde6f24a8="">is callable  <bound method A.method of <__main__.b object="" at="" 0x0000021fde6f24a8="">> is callable  >>>  在这里值得注意是A和B对象都是可以调用的,但是A的实例对象不能调用,因为它没有实现__call__方法。 来源:大坡3D软件开发
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