017-followers

Day 17 of the Udemy 100 Days of Code course: a small example of how to define and use a Python class.

This is a demonstration only. It has no plan, no tests and no dependencies.

What it shows

The User class in src/main.py demonstrates:

• a constructor (__init__) that sets attributes with default values
• instance attributes (id, username, followers, following)
• a method (follow) that changes the state of two objects at once

class User:

    def __init__(self, user_id, username):
        self.id = user_id
        self.username = username
        self.followers = 0
        self.following = 0

    def follow(self, user):
        user.followers += 1
        self.following += 1

When user_1.follow(user_2) runs, user_1.following goes up by one and user_2.followers goes up by one.

Run it

python src/main.py

Expected output:

0
1
1
0

The four lines are user_1.followers, user_1.following, user_2.followers and user_2.following.

Layout

Path	Purpose
src/main.py	The User class and the demo that uses it