Count Number of Instances

Create a class named User and create a way to check the number of users (number of instances) that were created, so that the value can be accessed as a class attribute.

Examples

u1 = User("johnsmith10")
User.user_count ➞ 1

u2 = User("marysue1989")
User.user_count ➞ 2

u3 = User("milan_rodrick")
User.user_count ➞ 3

Make sure that the usernames are accessible via the instance attribute username.

u1.username ➞ "johnsmith10"

u2.username ➞ "marysue1989"

u3.username ➞ "milan_rodrick"

Notes