使用onkey（）与Python turtle一起执行多项功能

Question

I'm trying to write a basic turtle drawing game/program and I've been using onkey(function, "key") to have the user input keystrokes. Well I wanted the user to be able to change the width of the pen by either hitting the up key to increase the width by one, or the down key to decrease the width by one. I know I need some kind of loop, but I don't really know where to implement it.

Answer 1

Here's a simple example that will make the turtle walk in a continuous circle while you press up and down arrows to change the pen width:

from turtle import Turtle, Screen

def larger():
    size = turtle.pensize()

    if size < 10:
        turtle.pensize(size + 1)

def smaller():
    size = turtle.pensize()

    if size > 1:
        turtle.pensize(size - 1)

def move():
    turtle.circle(150, extent=3)
    screen.ontimer(move, 100)

turtle = Turtle()

screen = Screen()
screen.onkey(larger, "Up")
screen.onkey(smaller, "Down")
screen.listen()

move()

screen.mainloop()

Make sure you click on the window first to make it the key listener.

Answer 2

I think you can't, but you can call the function insde the function you bind to the key:

from turtle import *

def function1():
    do_that = "do that"
    print(do_that)

def function2():
    do_this = "do this"
    print(do_this)
    function1()

onkey(function2, "space")

---

do this

do that

---

It worked for me ;)