#!/usr/bin/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('Abdulkalam')
kalam.sayHi()
kalam.howMany()
swaroop.sayHi()
swaroop.howMany()
del kalam
del swaroop
书上的代码可能有问题，最后两行是自己添上的。
类的变量 由一个类的所有对象（实例）共享使用，虽然对象的变量有相同的名称，但是是互不相关的，互不共享的。
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