How to allow kivy to watch in event1?

Question

linux

after launch

from kivy.app import App
from kivy.uix.button import Button

class TutorialApp (App):
  def build(self):
    return Button(text='hello',
      background_color=(0,0,0,1),
      font_size=150)

if __name__ == '__main__':
  TutorialApp().run()

and launch
$ python3 po.py
gives me an error

Exception in thread Thread-1:
 Traceback (most recent call last):
   File "/usr/lib/python3.4/threading.py", line 920, in _bootstrap_inner
     self.run()
   File "/usr/lib/python3.4/threading.py", line 868, in run
     self._target(*self._args, **self._kwargs)
   File "/usr/local/lib/python3.4/dist-packages/kivy/input/providers/mtdev.py", line 219, in _thread_run
     _device = Device(_fn)
   File "/usr/local/lib/python3.4/dist-packages/kivy/lib/mtdev.py", line 131, in __init__
     self._fd = os.open(filename, os.O_NONBLOCK | os.O_RDONLY)
 PermissionError: [Errno 13] Permission denied: '/dev/input/event1'

What to do?
Yes, you can write,
$ sudo python3 po.py
but you don’t want to run the program from su every time.
(debian 8, python 3)

Answer 1

And what prevents you from giving the necessary rights to the file node /dev/input/event1?
chmod and chgrp will help you, you can even write a rule for UDEV where you can immediately set all rights, or you can include commands in the boot script.