Objects and lazy iteration · Lesson 21 of 25

Classes and objects

Group state and behavior in one object.

8 minutes2 games

A class defines objects. __init__ initializes an instance after creation, and self refers to the current instance. Store instance state on self and call methods through the object.

Python

class Counter:
    def __init__(self, start=0):
        self.value = start

    def increment(self):
        self.value += 1
        return self.value

a = Counter()
b = Counter(10)
print(a.increment())
print(b.value)

a.value1int

b.value10int

Complete the code

Complete storing the student name.

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

Exercise

Define Box with a width and a double method returning twice the width. Print Box(4).double().

Expected output: 8

Python

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Python

Objects and lazy iteration · Lesson 21 of 25

Classes and objects

Group state and behavior in one object.

8 minutes2 games

A class defines objects. __init__ initializes an instance after creation, and self refers to the current instance. Store instance state on self and call methods through the object.

Python

class Counter:
    def __init__(self, start=0):
        self.value = start

    def increment(self):
        self.value += 1
        return self.value

a = Counter()
b = Counter(10)
print(a.increment())
print(b.value)

a.value1int

b.value10int

Complete the code

Complete storing the student name.

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

Exercise

Define Box with a width and a double method returning twice the width. Print Box(4).double().

Expected output: 8

Python

Learn more from

Played 0 of 2 games