typing_letters_pgz_one_letter.py

import pgzrun
from random import randint, choice
import string

WIDTH = 800
HEIGHT = 500
VELOCITY = 1
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
LETTER = {"letter": "", "x": 0, "y": 0}


def draw():  # Pygame Zero draw function
    screen.clear()
    screen.fill(BLACK)
    screen.draw.text(LETTER["letter"], (LETTER["x"], LETTER["y"]), fontsize=50, color=WHITE)


def update():  # Pygame Zero update function
    LETTER["y"] += VELOCITY


def on_key_down(key, mod, unicode):
    if unicode:
        if unicode == LETTER["letter"]:
            update_letter()


def update_letter():
    LETTER["letter"] = choice(string.ascii_letters).lower()
    LETTER["x"] = randint(10, WIDTH)
    LETTER["y"] = 1


update_letter()
pgzrun.go()