class Person(object):  # 定义一个父类
  def talk(self):  # 父类中的方法
    print("person is talking....")
class Chinese(Person):  # 定义一个子类， 继承Person类
  def walk(self):   # 在子类中定义其自身的方法
    print('is walking...')
c = Chinese()
c.talk()   # 调用继承的Person类的方法
c.walk()   # 调用本身的方法

class Person(object):
  def __init__(self, name, age):
    self.name = name
    self.age = age
    self.weight = 'weight'
  def talk(self):
    print("person is talking....")
class Chinese(Person):
  def __init__(self, name, age, language): # 先继承，在重构
    Person.__init__(self, name, age) #继承父类的构造方法，也可以写成：super(Chinese,self).__init__(name,age)
    self.language = language  # 定义类的本身属性
  def walk(self):
    print('is walking...')
class American(Person):
  pass
c = Chinese('bigberg', 22, 'Chinese')

class Person(object):
  def __init__(self, name, age):
    self.name = name
    self.age = age
    self.weight = 'weight'
  def talk(self):
    print("person is talking....")
class Chinese(Person):
  def __init__(self, name, age, language):
    Person.__init__(self, name, age)
    self.language = language
    print(self.name, self.age, self.weight, self.language)
  def talk(self): # 子类 重构方法
    print('%s is speaking chinese' % self.name)
  def walk(self):
    print('is walking...')
c = Chinese('bigberg', 22, 'Chinese')
c.talk()

class SchoolMember(object):
  '''学习成员基类'''
  member = 0
  def __init__(self, name, age, sex):
    self.name = name
    self.age = age
    self.sex = sex
    self.enroll()
  def enroll(self):
    '注册'
    print('just enrolled a new school member [%s].' % self.name)
    SchoolMember.member += 1
  def tell(self):
    print('----%s----' % self.name)
    for k, v in self.__dict__.items():
      print(k, v)
    print('----end-----')
  def __del__(self):
    print('开除了[%s]' % self.name)
    SchoolMember.member -= 1
class Teacher(SchoolMember):
  '教师'
  def __init__(self, name, age, sex, salary, course):
    SchoolMember.__init__(self, name, age, sex)
    self.salary = salary
    self.course = course
  def teaching(self):
    print('Teacher [%s] is teaching [%s]' % (self.name, self.course))
class Student(SchoolMember):
  '学生'
  def __init__(self, name, age, sex, course, tuition):
    SchoolMember.__init__(self, name, age, sex)
    self.course = course
    self.tuition = tuition
    self.amount = 0
  def pay_tuition(self, amount):
    print('student [%s] has just paied [%s]' % (self.name, amount))
    self.amount += amount
t1 = Teacher('Wusir', 28, 'M', 3000, 'python')
t1.tell()
s1 = Student('haitao', 38, 'M', 'python', 30000)
s1.tell()
s2 = Student('lichuang', 12, 'M', 'python', 11000)
print(SchoolMember.member)
del s2
print(SchoolMember.member)