How can I add random key pressed with turtle (that means that I don't want this:scr.onkey(fun,'r')?
I tried this...
import turtle as system
scr=system.Screen()
def p():
print('button pressed')
scr.onkey(p,any)
...but this does not work. How can I fix this?
Here's a complete example -- note that you were also not showing the listen() method in your code fragment which is also required:
from turtle import Screen, Turtle
def handler():
turtle.write("Button pressed!", align='center', font=('Arial', 18, 'normal'))
screen = Screen()
turtle = Turtle()
turtle.hideturtle()
screen.onkeypress(handler)
screen.listen()
screen.exitonclick()
Here's the story: The onkey() method is also known as onkeyrelease() and neither accepts None as a character, nor a missing character argument. @TimRoberts comment won't work. As @rdas notes (+1), use the onkeypress() method which does accept a None character, or simply a missing argument, and does what you want.
But here's a catch: Your event handler will trigger on any key, but you've no means within Turtle to determine which key. If you need that functionality, look at this answer which provides a replacement onkeypress() method that passes the character typed to your event handler, in the case where a character was not specified. (I.e. the None case.)
You can use onkeypress instead.
scr.onkeypress(p)
The key argument, if not given, will trigger the function for any key press.
Bind fun to key-press event of key if key is given, or to any key-press-event if no key is given.
onkey()will generate errors if you supplyNoneor omit the parameter. See @rdas answer aboutonkeypress(), or my answer for an explanation.