#"單下劃線" 開始的成員變數叫做保護變數，意思是隻有類物件和子類物件自己能訪問到這些變數；

#"雙下劃線" 開始的是私有成員，意思是隻有類物件自己能訪問，連子類物件也不能訪問到

#-*-coding:utf8-*-
class father():
	def __init__(self):
		print("father object")
	def __add(self):
		print("father add")
	def _main(self):
		self.__add()
		print("father man")
class son(father):
	def __add(self):
		print("son add")
test=son()
test._main()
 

實驗結果：

D:\Python36\python.exe D:/Users/liusen/PycharmProjects/coding_work/object_test/test_object.py
father object
father add
father man

Process finished with exit code 0

#-*-coding:utf8-*-
class father():
	def __init__(self):
		print("father object")
	def _add(self):
		print("father add")
	def _main(self):
		self._add()
		print("father man")
class son(father):
	def _add(self):
		print("son add")
test=son()
test._main()
 

實驗結果：

D:\Python36\python.exe D:/Users/liusen/PycharmProjects/coding_work/object_test/test_object.py
father object
son add
father man

Process finished with exit code 0

#-*-coding:utf8-*-
class father():
	def __init__(self):
		print("father object")
	def add(self):
		print("father add")
	def _main(self):
		self.add()
		print("father man")
class son(father):
	def add(self):
		print("son add")
test=son()
test._main()
 

實驗結果：

D:\Python36\python.exe D:/Users/liusen/PycharmProjects/coding_work/object_test/test_object.py
father object
son add
father man

Process finished with exit code 0