typewriter-2.py

import functools
import turtle

window = turtle.Screen()
typewriter = turtle.Turtle()


def type_letter(character):
    typewriter.write(character, font=("Courier", 30, "normal"))
    typewriter.forward(30)


window.onkeypress(
    functools.partial(type_letter, "a"),
    "a",
)
window.listen()

turtle.done()