Python AttributeError异常

Question

遇到一个很奇怪的问题，本人刚学习Python ,在学类与对象的方法时，在调用方法时，我的对象名取名为k ，然而死活就是报AttributeError异常; 在反复检查代码无误后，然后我试着改一下名字，奇迹出现了，名字一改就好了，我以为不能使用单个字母，抱着试一试的心态，我将对象名改为a ,奇迹再次出现，成功了！！！规则不是很懂，还请大神指教

 class Person:
    population=0
    def __init__(self,name):
        self.name=name
        print '(Initializing %s)'%self.name
        Person.population+=1
    def __del__(self):
        print'%s says bye.'%self.name
        Person.population-=1
        if Person.population==0:
            print 'I am the last one.'
        else:
             print 'There are still %d people left.'% Person.population
    def sayHi(self):
             print 'Hi,my name is %s.' % self.name
    def howMany(self):
        if Person.population==1:
            print 'I am the only person here.'
        else :
            print 'We have %d persons here.' % Person.population
swaroop=Person('swaroop')
swaroop.sayHi()
swaroop.howMany()

# 此处有问题   
a=Person('Abdul Kalam')
a.sayHi()
a.howMany()

swaroop.sayHi()
swaroop.howMany()

Answer 1

可能是关键字冲突的问题吧