objvar0.py

Python 实用例程

#!/usr/bin/env python # Filename: objvar.py class Person: '''Represents a person.''' population=0 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()