(二十七) 初遇python OOP面向对象编程-继承

#面向对象编程
#继承

class Employee:
  raise_amount = 1.04#定义列变量
  def __init__(self,first,last,pay):
    self.first = first
    self.last = last
    self.email = first + '.' + last +'@email.com'
    self.pay = pay

  def fullname(self):
    return '{} {}'.format(self.first,self.last)

  def apply_raise(self):
    self.pay = int(self.pay * self.raise_amount)
#定义子类Developer
#继承父类Employee
class Developer(Employee):
  raise_amount = 1.10
  def __init__(self,first,last,pay,prog_lang):
    #使用super继承父类的__init__方法
    super().__init__(first,last,pay)
    #也可以用
    #Employee.__init__(self,first,last,pay)
    #不建议这种方式
    self.prog_lang = prog_lang

dev_1 = Developer('T','Bag',50000,'Python')
dev_2 = Developer('Mc','User',6000,'Java')
print(dev_1.email)#T.Bag@email.com
print(dev_1.prog_lang)#Python
#使用help查看Developer类的使用
#print(help(dev_1))

#定义一个子类Manager
class Manager(Employee):
  def __init__(self,first,last,pay,employees=None):
    super().__init__(first,last,pay)
    if employees is None:
      employees = []
    else:
      self.employees = employees
  #添加员工
  def add_emp(self,emp):
    if emp not in self.employees:
      self.employees.append(emp)
  #删除员工
  def remove_emp(self,emp):
    if emp  in self.employees:
      self.employees.remove(emp)

  #打印员工全名
  def print_emps(self):
    for emp in self.employees:
      print('---->',emp.fullname())

mgr_1 = Manager('Su','DaQiang',100000,[dev_1])
print(mgr_1.email)#Su.DaQiang@email.com
mgr_1.print_emps()#----> T Bag
mgr_1.add_emp(dev_2)
mgr_1.print_emps()
#----> T Bag
#----> Mc User
mgr_1.remove_emp(dev_2)
mgr_1.print_emps()#----> T Bag

#使用内置方法
#isinstance():判断实例
#issubclass():判断子类
print(isinstance(mgr_1,Manager))
print(isinstance(mgr_1,Employee))
print(isinstance(mgr_1,Developer))
print(issubclass(Developer,Employee))
print(issubclass(Manager,Employee))
print(issubclass(Manager,Developer))

T.Bag@email.com
Python
Su.DaQiang@email.com
----> T Bag
----> T Bag
----> Mc User
----> T Bag
True
True
False
True
True
False