old_contents: # -*- coding: utf-8 -*-
  
  # Copyright (c) 2020 shmilee
  
  if __name__ == "__main__":
      iface = 'cli'
      if iface == 'gui':
          from .GUI import gui_script as i_script
      else:
          from .cli import cli_script as i_script
      i_script()
  
new_contents: # -*- coding: utf-8 -*-
  
  # Copyright (c) 2020 shmilee
  
  if __name__ == "__main__":
      import os
      iface = os.getenv('GDPY3_IFACE', default='gui')
      if iface == 'gui':
          from .GUI import gui_script as i_script
      else:
          from .cli import cli_script as i_script
      i_script()
  
subject: change module iface by environment variable GDPY3_IFACE