def __init__(self,name):
                '''Initializes the person's data.'''
                self.name=name
                print '(Initializing %s)' %self.name

                #When this person is created, he/she adds to the
population
                Person.population+=1

        def __del__(self):
                '''I am dying.'''
                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):
                '''Greeting by the person.

                Really, that's all it does.'''
                print 'Hi, my name is %s.' %self.name

        def howMany(self):
                '''Prints the current population.'''
                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()

kalam=Person('Abdul Kalam')
kalam.sayHi()
kalam.howMany()

swaroop.sayHi()
swaroop.howMany()

这是简明Python教程里的一个例子
我使用PyScripter调试的

2个问题
1.为什么我run第一次和第二次的结果是不同的
2.如何设置断点调试python程序