typewriter-9.py

import functools
import turtle
import string

character_width = 30
character_height = 40

window = turtle.Screen()
window.bgcolor(0.1, 0.1, 0.1)
window.tracer(0)
window.title("Tiny Turtle Typewriter")

typewriter = turtle.Turtle()
typewriter.color(0.9, 0.9, 0.9)
typewriter.penup()
typewriter.setposition(
    -window.window_width() / 2 + character_width,
    window.window_height() / 2 - character_height,
)
# Make the turtle look like a cursor
typewriter.shape("square")
typewriter.shapesize(0.1, 1)

# Select keys that are on a typewriter
typewriter_keys = {
    # unpack string.ascii_letters, string.digits,
    # and string.punctuation into a set
    *(
        string.ascii_letters
        + string.digits
        + string.punctuation
    )
    # remove the minus sign and add "minus"
    # and add "space", "Return", and "BackSpace"
} - {"-"} | {"minus", "space", "Return", "BackSpace"}


# Define a function that takes a character as an argument
# and writes it to the screen
def type_letter(character):
    if character == "minus":
        character = "-"
    elif character == "space":
        character = " "
    elif character == "Return":
        typewriter.setposition(
            -window.window_width() / 2 + character_width,
            typewriter.ycor() - character_height,
        )
        window.update()
        return
    elif character == "BackSpace":
        for _ in range(2):
            typewriter.undo()
        window.update()
        return
    typewriter.write(
        character, font=("Courier", character_width, "normal")
    )
    typewriter.forward(character_width)
    window.update()


for character in typewriter_keys:
    window.onkeypress(
        lambda character=character: type_letter(character),
        character,
    )
window.listen()
window.update()
turtle.done()