def __del__(self):
'''I am dying.'''
print '%s is dying ' %self.name
print '%s says bye.' % self.name
self.__class__.population -= 1
if self.__class__.population == 0
print 'I am the last one.'
else:
print 'There are still %d people left.' % self.__class__.population
......
Jack = Person('Jack')
Jack.sayHi()
Jack.howMany()
Tom = Person('Tom')
Tom.sayHi()
Tom.howMany()
Jack.sayHi()
Jack.howMany()
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