A whole game: cheat sheet

audio.beep

Plays notes from text. Put it where something happens in update(), once, not in draw(). Try "duration 100 C E G" or "saw C2".

audio.beep("C E G")

A list of objects

In update(), tell every object to move; in draw(), tell every object to draw. The loop stays short however many there are.

for star in stars:
    star.move()

random.randint

A whole number picked at random from the first to the second, both included. import random goes at the top of the game.

import random

random.randint(-90, 90)

touches

True when this object is close to (x, y) in both directions: abs() is the distance, whichever side it is on.

def touches(self, x, y):
    return abs(self.x - x) < 12 and abs(self.y - y) < 8

class with move and draw

Each object keeps its own x and y in self, moves itself and draws itself.

class Star:
    def __init__(self, x):
        self.x = x
        self.y = 100

    def move(self):
        self.y -= 1

    def draw(self):
        screen.fillRound(self.x, self.y, 8, 8, "yellow")

Example

class Star:
    def __init__(self, x):
        self.x = x
        self.y = 60

    def draw(self):
        screen.fillRound(self.x, self.y, 10, 10, "rgb(255,210,0)")

stars = []
for i in range(4):
    stars.append(Star(-60 + i * 40))

def draw():
    screen.clear("rgb(10,10,40)")
    for star in stars:
        star.draw()

What it draws — Four Star objects, each drawn at its own x.