class  Programer(object):
   hobby = "Play computer"
   def __init__(self,name,age,weight):
       self.name = name
       self._age = age
       self.__weight = weight
   @classmethod
   def  get_hobby(cls):
       return cls.hobby

   @property
   def get_weight(self):
       return self.__weight

   def self_introduction(self):
       print "My name is %s \n I'm %d years old"%(self.name,self._age)


if __name__ == "__main__":
   programer = Programer("Albert",25,80)
   print dir(programer)
   print programer.__dict__
   print Programer.get_hobby()
   print programer.get_weight
   print programer.self_introduction()