code: def region_selection(request):
      '''Handle submission of the region selection form in the base template. '''
      form = get_region_select_form(request.GET)
      abbr = form.data.get('abbr')
      if not abbr or len(abbr) != 2:
          return redirect('homepage')
      return redirect('region', abbr=abbrf region_selection(request):
      '''Handle submission of the region selection form in the base template. '''
      form = get_region_select_form(request.GET)
      abbr = form.data.get('abbr')
      if not abbr or len(abbr) != 2:
          return redirect('homepage')
      return redirect('region', abbr=abbr)
docs: Handle submission of the region selection form in the base template.