code: def _process_key(evt):
      """Helper to convert from wx keycode to vispy keycode"""
      key = evt.GetKeyCode()
      if key in KEYMAP:
          return KEYMAP[key], ""
      if 97 <= key <= 122:
          key -= 32
      if key >= 32 and key <= 127:
          return keys.Key(chr(key)), chr(key)
      else:
          return None, None
  
imports: from __future__ import division
  from time import sleep
  import gc
  import warnings
  from ..base import BaseApplicationBackend, BaseCanvasBackend, BaseTimerBackend
  from ...util import keys, logger
  from ...util.ptime import time
  from ...None import config
label_desc: Use image node_id 3 for calling a global function with example usage: _process_key(evt) and returns: KEYMAP,  str, keys,  chr, None,  None