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例子的链接：
http://www.woodpecker.org.cn:9081/doc/abyteofpython_cn/chinese/ch11s06.html
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 crea ...