Python 内置函数

call()

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)
 
输出 
origin :100
x :2000