多态： 同一类型的不同实例对同一消息做出的不同反应。 第一种方法
import math class Circle: def __init__(self,radius): self.radius = radius def get_area(self): return math.pi * self.radius ** 2 c = Circle(6) print("圆的面积是：{}".format(c.get_area()))结果是： 圆的面积是：113.09733552923255 第二种方法
import math class Circle: def __init__(self,radius): self.radius = radius # def get_area(self): # return math.pi * self.radius ** 2 @property def area(self): return math.pi * self.radius ** 2 c = Circle(6) # print("圆的面积是：{}".format(c.get_area())) print("圆的面积是:{}".format(c.area))结果是： 圆的面积是:113.09733552923255
class Employee: def __init__(self,department,name,birthdate,salary): self.department = department self.name = name self.birthdate = birthdate self.salary = salary def __repr__(self): return "<员工:{}>".format(self.name) def working(self): print("员工:{},在工作".format(self.name)) class Programer(Employee): def __init__(self,department,name,birthdate,salary,specialty,project): super().__init__(department,name,birthdate,salary) self.specialty = specialty self.project = project def working(self): print("程序员:{}在开发项目{}".format(self.name,self.project)) import datetime p = Programer("技术部","peter",datetime.date(1990,3,1),8000,"python","CRM") print(p.salary) print(p.working()) print(p)结果是： 8000 程序员:peter在开发项目CRM None <员工:peter>
class Employee: def __init__(self,department,name,birthdate,salary): self.department = department self.name = name self.birthdate = birthdate self.salary = salary def give_raise(self,percent,bonus=.0): self.salary = self.salary * (1 + percent + bonus) def __repr__(self): return "<员工:{}>".format(self.name) def working(self): print("员工:{},在工作".format(self.name)) class Programer(Employee): def __init__(self,department,name,birthdate,salary,specialty,project): super().__init__(department,name,birthdate,salary) self.specialty = specialty self.project = project def working(self): print("程序员:{}在开发项目{}".format(self.name,self.project)) import datetime p = Programer("技术部","peter",datetime.date(1990,3,1),8000,"python","CRM") print(p.salary) print(p.working()) print(p) p.give_raise(.2,.1) print(p.salary)结果是： 8000 程序员:peter在开发项目CRM None <员工:peter> 10400.0
class Employee: def __init__(self,department,name,birthdate,salary): self.department = department self.name = name self.birthdate = birthdate self.salary = salary @property def age(self): return datetime.date.today().year - self.birthdate.year def give_raise(self,percent,bonus=.0): self.salary = self.salary * (1 + percent + bonus) def __repr__(self): return "<员工:{}>".format(self.name) def working(self): print("员工:{},在工作".format(self.name)) class Programer(Employee): def __init__(self,department,name,birthdate,salary,specialty,project): super().__init__(department,name,birthdate,salary) self.specialty = specialty self.project = project def working(self): print("程序员:{}在开发项目{}".format(self.name,self.project)) import datetime p = Programer("技术部","peter",datetime.date(1990,3,1),8000,"python","CRM") print(p.salary) print(p.working()) print(p) p.give_raise(.2,.1) print(p.salary) print(p.age)结果是： 8000 程序员:peter在开发项目CRM None <员工:peter> 10400.0 29
class Employee: import datetime def __init__(self,department,name,birthdate,salary): self.department = department self.name = name self.birthdate = birthdate self.salary = salary @property def age(self): return datetime.date.today().year - self.birthdate.year def give_raise(self,percent,bonus=.0): self.salary = self.salary * (1 + percent + bonus) def __repr__(self): return "<员工:{}>".format(self.name) class HR(Employee): def __init__(self,department,name,birthdate,salary,qualifcation_level=1): Employee.__init__(self,department,name,birthdate,salary) self.qualifcation_level = qualifcation_level def working(self): print("人事:{}在面试新员工".format(self.name)) if __name__ == "__main__": import datetime hr = HR("人事部","tom",datetime.date(1985,3,3),9000,qualifcation_level=3) hr.give_raise(.1) print(hr.salary) hr.working()结果是： 9900.0 人事:tom在面试新员工
