类的派生 - 好文

目录

* 一、派生 <https://www.cnblogs.com/nickchen121/p/10987834.html#一派生>
* 1.1 派生方法一(类调用)
<https://www.cnblogs.com/nickchen121/p/10987834.html#派生方法一类调用>
* 1.2 派生方法二(super)
<https://www.cnblogs.com/nickchen121/p/10987834.html#派生方法二super>
一、派生

* 派生：子类中新定义的属性的这个过程叫做派生，并且需要记住子类在使用派生的属性时始终以自己的为准

1.1 派生方法一(类调用)

* 指名道姓访问某一个类的函数：该方式与继承无关 class OldboyPeople: """由于学生和老师都是人，因此人都有姓名、年龄、性别"""
school = 'oldboy' def __init__(self, name, age, gender): self.name = name
self.age = age self.gender = gender class OldboyStudent(OldboyPeople):
"""由于学生类没有独自的__init__()方法，因此不需要声明继承父类的__init__()方法，会自动继承""" def
choose_course(self): print('%s is choosing course' % self.name) class
OldboyTeacher(OldboyPeople): """由于老师类有独自的__init__()方法，因此需要声明继承父类的__init__()"""
def __init__(self, name, age, gender, level): OldboyPeople.__init__(self, name,
age, gender) self.level = level # 派生 def score(self, stu_obj, num): print('%s
is scoring' % self.name) stu_obj.score = num stu1 = OldboyStudent('tank', 18,
'male') tea1 = OldboyTeacher('nick', 18, 'male', 10) print(stu1.__dict__)
{'name': 'tank', 'age': 18, 'gender': 'male'} print(tea1.__dict__) {'name':
'nick', 'age': 18, 'gender': 'male', 'level': 10}
1.2 派生方法二(super)

*
严格以来继承属性查找关系

*
super()会得到一个特殊的对象，该对象就是专门用来访问父类中的属性的（按照继承的关系）

*
super().__init__(不用为self传值)

*
super的完整用法是super(自己的类名,self),在python2中需要写完整，而python3中可以简写为super()
class OldboyPeople: school = 'oldboy' def __init__(self, name, age, sex):
self.name = name self.age = age self.sex = sex class
OldboyStudent(OldboyPeople): def __init__(self, name, age, sex, stu_id): #
OldboyPeople.__init__(self,name,age,sex) # super(OldboyStudent,
self).__init__(name, age, sex) super().__init__(name, age, sex) self.stu_id =
stu_id def choose_course(self): print('%s is choosing course' % self.name) stu1
= OldboyStudent('tank', 19, 'male', 1) print(stu1.__dict__) {'name': 'tank',
'age': 19, 'sex': 'male', 'stu_id': 1}

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