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python中__call__内置函数用法实例

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Release: 2016-06-10 15:10:52
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本文实例讲述了python中__call__内置函数的用法。分享给大家供大家参考。具体分析如下:

对象通过提供__call__(slef, [,*args [,**kwargs]])方法可以模拟函数的行为,如果一个对象x提供了该方法,就可以像函数一样使用它,也就是说x(arg1, arg2...) 等同于调用x.__call__(self, arg1, arg2)。模拟函数的对象可以用于创建仿函数(functor) 或代理(proxy)

class DistanceForm(object):
  def __init__(self, origin):
    self.origin = origin
    print "origin :"+str(origin)
  def __call__(self, x):
    print "x :"+str(x)
p = DistanceForm(100)
p(2000)
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输出:

>>> 
origin :100
x :2000
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希望本文所述对大家的Python程序设计有所帮助。

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