Description

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Advanced · 13 min

Classes and instances

Model related data and behavior with a small class.

Create an instance

__init__ sets the initial state of each new instance. self refers to the instance receiving the method call.

class Account:
    def __init__(self, owner):
        self.owner = owner

account = Account("Ada")
print(account.owner)

Output

Ada

Add behavior

An instance method can read and update that instance state while keeping the rule close to the data.

class Counter:
    def __init__(self):
        self.value = 0
    def add(self):
        self.value += 1

counter = Counter()
counter.add()
print(counter.value)

Output

1

Classes and instances

  1. Read both classes and instances examples before answering.
  2. Run the task, compare its exact output, and revise the code if needed.

Try it yourself

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Model a wallet

Complete Wallet so deposit adds to balance. Keep the supplied calls and display 15.

Practice