python

# Encapsulation 封装 just convention 只是约定，实际还是能访问的 

class Person:
    
    address='test' # class attribute
    
    def __init__(self,name,age):
        self.name=name
        self._age=age # non-public instance variables 实例变量 
        
    # public method
    def show_age(self):
        return self._age
        
    def get_age(self):
        return self._get_age()
        
    # non-public method
    def _get_age(self):
        return self._age
        
p=Person('Pawn',26)
print (p.address)
print (p.name,p._age)
print (p.show_age())
print (p._get_age())