Python 类class

#! /usr/bin/python3.4

"""
在python中，类的属性和方法默认为"公共的"
以__开头定义为私有，会自动变形名称（_Classname__Methodname）
私有属性防止多重继承的时候出错
"""

class Students():

	def __init__(self,my_name,my_id,my_year): #自动运行
		self.s_name = my_name
		self.s_id   = my_id
		self.__year = my_year
		print("Students init success .. ")

	def print_name(self):
		print(self.s_name)

	def print_id(self):
		print(self.s_id)

	def __print_year(self):
		print(self.__year)



class my_Students(Students): #继承 Students 
	"""也可以定义自己的__init__
	def __init__(self,my_name,my_id): 
		self.s_name = my_name
		self.s_id   = my_id		
		print("my_Students init success .. ")
	"""

	def show_student(self):
		print(self.s_id,':',self.s_name)


if __name__ == "__main__":

	s = Students("feng",132,19)
	print(s.s_name)
	s.print_name()
	print(s.s_id)
	s.print_id()
	print(s._Students__year) #变形后可访问
	s._Students__print_year() #变形后可访问	

	print("-------------")

	my_s = my_Students("zhang",101,20)
#	my_s = my_Students("zhang",123) #自定义的
	my_s.print_name()
	my_s.print_id()	
	my_s._Students__print_year()  #变形后可访问
	my_s.show_student()