dont-try-this-at-home-16.py

# Do not try this at home…

import turtle
import random
import itertools

# Starts off fairly "normal"…
n_turtles = 100

window = turtle.Screen()
window.tracer(0)
window.setup(700, 700)
window.bgcolor(0.2, 0.2, 0.2)

# A mammoth list comprehension to create all
# the turtles and set their initial state
cute_turtles = [
    (
        cute_turtle := turtle.Turtle(),
        cute_turtle.left(idx * (360 / n_turtles)),
        cute_turtle.color(
            random.random(),
            random.random(),
            random.random(),
        ),
        cute_turtle.penup(),
        cute_turtle.shape("turtle"),
    )
    for idx in range(n_turtles)
]

# Run the animation without a while loop
list(
    map(
        lambda _: (
            [
                (
                    cute_turtle.forward(1),
                    cute_turtle.setheading(180 - cute_turtle.heading())
                    if abs(cute_turtle.xcor()) > window.window_width() / 2
                    else None,
                    cute_turtle.setheading(-cute_turtle.heading())
                    if abs(cute_turtle.ycor()) > window.window_height() / 2
                    else None,
                )
                for cute_turtle, *_ in cute_turtles
            ],
            window.update(),
        ),
        itertools.cycle([None]),
    )
)