python类定义内部调用对象的实例

python类定义内部调用对象的实例 

#coding:utf-8

 

class Newclass:

    def __init__(self,intval = 1):

        self.the_int = intval

        if  intval % 2 == 0:

            self.parity = 'even'

        else :

            self.parity = 'odd'

 

    def process(self,instance):

        thesum = self.the_int + instance.the_int

        if   thesum < 0 :

            return 'nagative'

 

        elif  thesum % 2 == 0:

            return 'even'

        else :

            return 'odd'

    def __str__(self):

        return "value %d is %s" % (self.the_int,self.parity)

 

inst1 = Newclass(4)

inst2 = Newclass(-5)

inst3 = Newclass()

#print inst1

#print inst1.process(inst3)

print inst3.process(inst1)

print inst3