repr方法字符串输出实例对象的值

#coding=utf-8
#repr方法字符串输出实例对象的值
class CountFromBy(object):

    def __init__(self, val=0, incr=1):
        self.val = val
        self.incr = incr

    def increase(self):
        self.val += self.incr

    def __repr__(self):
        return str(self.val)

>>> c = CountFromBy()
>>> c
0