Python学习（三）：入门篇：Python中怎么编写类

#person.py

class person:
    """class to representaion a person"""
    def __init__(self,name,age):
        self.name=name
        if 0<age<=150:
            self.age=age        
        else:
            print ‘age is no valid!‘    
    def display(self):
        print(‘person(%s,%d)‘%(self.name,self.age))
        
    def __str__(self):
        return ‘person(%s,%d)‘ %(self.name,self.age)
    def __repr__(self):
        return str(self)
    

>>> p=person(‘hehe‘,30)
>>> p.name
‘hehe‘
>>> p.age
30

self.__age=age

>>>p=person(‘hehe‘,30)
>>>p._person__age