Series of examples to get you started with PyGame Zero

pygz_intro_01.py

"""
Code to open a pgz window
"""
import pgzrun

WIDTH = 800
HEIGHT = 500
BLACK = (0, 0, 0)

def draw():  # Pygame Zero draw function
    screen.clear()
    screen.fill(BLACK)

pgzrun.go()

pygz_intro_02.py

"""
Code to display a letter in the middle of a pgz window
"""
import pgzrun

WIDTH = 800
HEIGHT = 500
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)

def draw():  # Pygame Zero draw function
    screen.clear()
    screen.fill(BLACK)
    screen.draw.text("A", (WIDTH/2, HEIGHT/2), fontsize=50, color=WHITE)

pgzrun.go()

pygz_intro_03.py

"""
Code to display a random letter in the center of the screen
"""
import pgzrun
from random import choice
import string

WIDTH = 800
HEIGHT = 500
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)

def draw():  # Pygame Zero draw function
    screen.clear()
    screen.fill(BLACK)
    screen.draw.text(choice(string.ascii_letters), (WIDTH/2, HEIGHT/2), fontsize=50, color=WHITE)

pgzrun.go()

pygz_intro_04.py

"""
Code to take an input from the user and display it on screen
"""
import pgzrun

WIDTH = 800
HEIGHT = 500
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
LETTER = {"letter": "Give an input"}

def draw():  # Pygame Zero draw function
    screen.clear()
    screen.fill(BLACK)
    screen.draw.text(LETTER["letter"], (WIDTH/2, HEIGHT/2), fontsize=50, color=WHITE)

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

pgzrun.go()

pygz_intro_05.py

"""
Code to display a take input from the user and display it on screen at random locations
"""
import pgzrun
from random import randint

WIDTH = 800
HEIGHT = 500
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
LETTER = {"letter": "Give an input", "x": WIDTH / 2, "y": HEIGHT / 2}


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 on_key_down(key, mod, unicode):
    if unicode:
        LETTER["letter"] = unicode
        LETTER["x"] = randint(1, WIDTH)
        LETTER["y"] = randint(1, HEIGHT)


pgzrun.go()

pygz_intro_06.py

"""
Code to display 1 random letter and change it when user enters the letter
"""
import pgzrun
from random import randint, choice
import string

WIDTH = 800
HEIGHT = 500
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 on_key_down(key, mod, unicode):
    if unicode:
        if LETTER["letter"] == unicode:
            update_letter()


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


update_letter()
pgzrun.go()

pygz_intro_07.py

"""
Code to display 1 random letter falling from the top of the screen
and change it when user enters the letter
"""
import pgzrun
from random import randint, choice
import string

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


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():
    LETTER["y"] += VELOCITY


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


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


update_letter()
pgzrun.go()

pygz_intro_08.py

"""
Code to invoke update_letter if letter falls below the screen
"""
import pgzrun
from random import randint, choice
import string

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


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():
    LETTER["y"] += VELOCITY
    if LETTER["y"] == HEIGHT - 5:
        update_letter()


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


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


update_letter()
pgzrun.go()

pygz_intro_09.py

"""
Code to keep a track of Right letters  Wrong letters entered
"""
import pgzrun
from random import randint, choice
import string

WIDTH = 800
HEIGHT = 500
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
LETTER = {"letter": "", "x": 0, "y": 0}
VELOCITY = 1
SCORE = {"RIGHT": 0, "WRONG": 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)
    screen.draw.text("RIGHT: " + str(SCORE["RIGHT"]), (WIDTH - 130, 10), fontsize=30, color=WHITE)
    screen.draw.text("WRONG: " + str(SCORE["WRONG"]), (WIDTH - 130, 40), fontsize=30, color=WHITE)


def update():
    LETTER["y"] += VELOCITY
    if LETTER["y"] == HEIGHT - 5:
        SCORE["WRONG"] += 1
        update_letter()


def on_key_down(key, mod, unicode):
    if unicode:
        if LETTER["letter"] == unicode:
            SCORE["RIGHT"] += 1
            update_letter()
        else:
            SCORE["WRONG"] += 1


def update_letter():
    LETTER["letter"] = choice(string.ascii_letters).lower()
    LETTER["x"] = randint(10, WIDTH - 20)
    LETTER["y"] = 1


update_letter()
pgzrun.go()

pygz_intro_10.py

"""
Code to have atleast 4 letters falling down at a given time
"""
import pgzrun
from random import randint, choice
import string

WIDTH = 800
HEIGHT = 500
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
# LETTER = {"letter": "", "x": 0, "y": 0}
ON_SCREEN_LETTERS = []
VELOCITY = 1
SCORE = {"RIGHT": 0, "WRONG": 0}


def draw():  # Pygame Zero draw function
    screen.clear()
    screen.fill(BLACK)
    for LETTER in ON_SCREEN_LETTERS:
        screen.draw.text(LETTER["letter"], (LETTER["x"], LETTER["y"]), fontsize=50, color=WHITE)
    screen.draw.text("RIGHT: " + str(SCORE["RIGHT"]), (WIDTH - 130, 10), fontsize=30, color=WHITE)
    screen.draw.text("WRONG: " + str(SCORE["WRONG"]), (WIDTH - 130, 40), fontsize=30, color=WHITE)


def update():
    for i, LETTER in enumerate(ON_SCREEN_LETTERS):
        LETTER["y"] += VELOCITY
        if LETTER["y"] == HEIGHT - 5:
            SCORE["WRONG"] += 1
            delete_letter(i)
    while len(ON_SCREEN_LETTERS) < 4:
        add_letter()


def on_key_down(key, mod, unicode):
    if unicode:
        for i, LETTER in enumerate(ON_SCREEN_LETTERS):
            if LETTER["letter"] == unicode:
                SCORE["RIGHT"] += 1
                delete_letter(i)
                return
        else:
            SCORE["WRONG"] += 1


def add_letter():
    letter = choice(string.ascii_letters).lower()
    x = randint(10, WIDTH - 20)
    y = 1
    ON_SCREEN_LETTERS.append({"letter": letter, "x": x, "y": y})


def delete_letter(i):
    del ON_SCREEN_LETTERS[i]
    add_letter()


pgzrun.go()

Nice. Browsed through the code. Will test them all. I will take it from here.