How can I add an instance attribute in subclass?

Question

This is my code:

class Person:
    def __init__(self, name):
        self.name = name


class Student(Person):

    def register(self, school):
        pass
    def payfee(self, money):
        pass
    def chooseClassAndGrand(self, obj):
        pass

class Teacher(Person):
    pass

I want to add a class instance property to the Student class, how to do with that in the Student class code, if I do not want to rewrite the __init__() method?

You don't need to rewrite init. You call the super class' init in your init, and then declare your instance variable. — cs95
– cs95, Commented Jul 30, 2017 at 15:30
class is a reserved keyword and will throw errors. You need to have a different name for the property — Ronnie
– Ronnie, Commented Jul 30, 2017 at 15:35

cs95 · Accepted Answer · 2017-07-30 15:40:34Z

2

You do not need to rewrite __init__. Assuming you want Person's __init__ functionality to be invoked when creating an instance of Student, you may use the super keyword inside the __init__ function of Student:

class Student(Person):
    def __init__(self):
        super().__init__() # python3.0+
        self.classAndGrade = ...

    ...

If you're on python < 3.0, you can use

super(Person, self).__init__()

This is the easiest way to do it.

edited Jul 30, 2017 at 15:40

answered Jul 30, 2017 at 15:35

cs95

406k106 gold badges745 silver badges798 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

user7693832 Over a year ago

My Person class is Classic class, can not use the super(), it will report ·TypeError: must be type, not classobj error

aircraft · Accepted Answer · 2017-07-31 01:40:01Z

0

Do add to COLDSPEED, you can also use the below to add attributes:

class Student(Person):
    def __init__(self, name, classAndGrade):
        Person.__init__(self, name)
        self.classAndGrade = classAndGrade

    ...

answered Jul 31, 2017 at 1:40

aircraft

27.2k29 gold badges104 silver badges175 bronze badges

Collectives™ on Stack Overflow

How can I add an instance attribute in subclass?

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related