'''
面向对象编程
python对象中的方法和属性私有使用__定义,但是私有属性可以使用obj._ClassName.__attr访问(函数一样) 使用关键字class定义
'''

class Student(object): 
 __score = 0
 # __init__是一个特殊方法用于在创建对象时进行初始化操作 self为类实例相当于java中的this
 # 通过这个方法我们可以为学生对象绑定name和age两个属性
 def __init__(self, name, age, score):
 self.name = name
 self.age = age
 self.__score = score

 def study(self, course_name):
 print('%s正在学习%s' % (self.name, course_name))

 # PEP 8要求标识符的名字用全小写多个单词用下划线连接
 # 但是部分程序员和公司更倾向于使用驼峰命名法(驼峰标识)
 def watch_movie(self):
 if self.age < 18:
 print('%s只能观看《熊出没》.' % self.name)
 else:
 print('%s正在观看岛国爱情大电影.' % self.name)

 def __eat(self):
 print("吃东西,这是私有的")


class Employee:
 '所有员工的基类'
 empCount = 0
 
 def __init__(self, name, salary):
 self.name = name
 self.salary = salary
 Employee.empCount += 1
 
 def displayCount(self):
 print("Total Employee %d" % Employee.empCount)
 
 def displayEmployee(self):
 print("Name : ", self.name, ", Salary: ", self.salary)

print('Employee.__doc__:', Employee.__doc__) # 所有员工的基类
print("Employee.__name__:", Employee.__name__) # Employee
print("Employee.__module__:", Employee.__module__) # __main__
print("Employee.__bases__:", Employee.__bases__)
print("Employee.__dict__:", Employee.__dict__)

def main():
 stu1 = Student('张三', 29, 90) 
 stu1.study('Python程序设计')
 stu1.watch_movie()
 stu1 = Student('李四', 16, 86) 
 stu1.study('世界历史')
 stu1.watch_movie()
 # print(stu1.__score) # 访问私有变量报错
 print(stu1._Student__score)
 #stu1.__eat() # 访问私有方法报错
 stu1._Student__eat()

if __name__ == '__main__':
 main()