python __call__ 函数

//转自http://www.cnblogs.com/lovemo1314/archive/2011/04/29/2032871.html

 __call__

Python中有一个有趣的语法，只要定义类型的时候，实现__call__函数，这个类型就成为可调用的。

换句话说，我们可以把这个类型的对象当作函数来使用，相当于 重载了括号运算符。

class g_dpm(object):

    def __init__(self, g):
        self.g = g

    def __call__(self, t):
        return (self.g*t**2)/2

计算地球场景的时候，我们就可以令e_dpm = g_dpm(9.8)，s = e_dpm(t)。

class Animal(object):
    def __init__(self, name, legs):
        self.name = name
        self.legs = legs
        self.stomach = []        
 
    def __call__(self,food):
        self.stomach.append(food)
 
    def poop(self):
        if len(self.stomach) > 0:
            return self.stomach.pop(0)
 
    def __str__(self):        
        return 'A animal named %s' % (self.name)       
 
cow = Animal('king', 4)  #We make a cow
dog = Animal('flopp', 4) #We can make many animals
print 'We have 2 animales a cow name %s and dog named %s,both have %s legs' % (cow.name, dog.name, cow.legs)
print cow  #here __str__ metod work
 
#We give food to cow
cow('gras')
print cow.stomach
 
#We give food to dog
dog('bone')
dog('beef')
print dog.stomach
 
#What comes inn most come out
print cow.poop()
print cow.stomach  #Empty stomach
 

'''-->output
We have 2 animales a cow name king and dog named flopp,both have 4 legs
A animal named king
['gras']
['bone', 'beef']
gras
[]
'''