Python中类的使用
#coding=utf8'''Created on 2011-6-12@author: hufei'''name = 'hufei'if not name:passelse:class Person: # class can be defined in a branch of 'if' statementdef __init__(self,name,age):self.name = nameself.age = agedef __str__(self):return u"%s:%d" % (self.name, self.age)def say_hello(self):print 'Hello'def say_hi(name):print u"%s:hi" % namedef say_hello(name):print u"%s: hello!" % namemaimai = Person('maimai',22)#attributes need not be declared, they spring into existence when they are first assignedmaimai.sex = 'Female' print maimai #invoke __str__print maimai.sexprint type(maimai.age)print type(maimai.say_hello) # <type 'instancemethod'>maimai.say_hello = say_hi # methodname just looks like a reference, can be modifiedmaimai.say_hello('Jack')maimai.say_hi = say_hello # method of Class can be added dynamicallymaimai.say_hi('Tom')python中的类的语法与java相比，灵活多变。相比而言，java是严格而规范的语言，而python给人更加随意的感觉。
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