gpiozero button_when pressed reference to function - Raspberry Pi Forums

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during oop-course, tried improve turtle race 4 buttons.
according gpiozero documentation 1.4.0 page 7 code should be
button1.when_pressed = lauraforward # lauraforward = function move turtle laura

code not move turtles, not stop, displays error messages each time button pressed.
what's wrong?
error messages:
##traceback (most recent call last):
## file "/usr/lib/python3/dist-packages/gpiozero/pins/rpigpio.py", line 232, in <lambda>
## callback=lambda channel: self._when_changed(),
## file "/usr/lib/python3/dist-packages/gpiozero/mixins.py", line 311, in _fire_events
## self._fire_activated()
## file "/usr/lib/python3/dist-packages/gpiozero/mixins.py", line 343, in _fire_activated
## super(holdmixin, self)._fire_activated()
## file "/usr/lib/python3/dist-packages/gpiozero/mixins.py", line 289, in _fire_activated
## self.when_activated()
## file "/home/pi/downloads/2017courseoop/turtlerace4buttons.py", line 15, in lauraforward
## laura.forward(randint(1,2))
## file "/usr/lib/python3.4/turtle.py", line 1637, in forward
## self._go(distance)
## file "/usr/lib/python3.4/turtle.py", line 1605, in _go
## self._goto(ende)
## file "/usr/lib/python3.4/turtle.py", line 3158, in _goto
## screen._pointlist(self.currentlineitem),
## file "/usr/lib/python3.4/turtle.py", line 755, in _pointlist
## cl = self.cv.coords(item)
## file "<string>", line 1, in coords
## file "/usr/lib/python3.4/tkinter/__init__.py", line 2310, in coords
## self.tk.call((self._w, 'coords') + args))]
##runtimeerror: main thread not in main loop

program code:

code: select all

from turtle import turtle random import randint gpiozero import button signal import pause  button1 = button(6) button2 = button(13) button3 = button(19) button4 = button(26)  def lauraforward():     print("laura")     laura.forward(randint(1,2))  def rikforward():         print("rik")     rik.forward(randint(1,2))  def laurenforward():         print("lauren")     lauren.forward(randint(1,2))  def carrieanneforward():     print("carrieanne")     carrieanne.forward(randint(1,2))  laura = turtle()  laura.color("red") laura.shape("turtle")  laura.penup() laura.goto(-160,100) laura.pendown()  rik = turtle()  rik.color("green") rik.shape("turtle")  rik.penup() rik.goto(-160,70) rik.pendown()  lauren = turtle()  lauren.color("blue") lauren.shape("turtle")  lauren.penup() lauren.goto(-160,40) lauren.pendown()  carrieanne = turtle()  carrieanne.color("pink") carrieanne.shape("turtle")  carrieanne.penup() carrieanne.goto(-160,10) carrieanne.pendown()  # test function lauraforward in range(10):     lauraforward() print()  # part causes error message # code based on gpiozero documentation page 7  button1.when_pressed = lauraforward button2.when_pressed = rikforward button3.when_pressed = laurenforward button4.when_pressed = carrieanneforward  pause()

it seems tkinter isn't @ running outside main thread. https://stackoverflow.com/questions/146 ... -main-loop horrible hack functions added instructions lists and, in version based on previous (presumably) used keyboard input in loop, instructions list.

code: select all

... def lauraforward():     global laura_list     print("laura")     laura_list.append(randint(1, 2)) ... laura_list = [] ... while loop     ...     if len(laura_list) > 0:         laura.forward(laura_list.pop(0))


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