code: def keyboard_field(value, args=None):
      
      qs = QueryDict(args)
      per_line = qs.get('per_line', 1)
      field = qs.get("field", "slug")
      command = qs.get("command")
      convert = lambda element: "/" + command + " " + str(getattr(element, field))
      group = lambda flat, size: [flat[i:i+size] for i in range(0, len(flat), size)]
      grouped = group(value, int(per_line))
      new_list = []
      for line in grouped:
          new_list.append([convert(e) for e in line])     
      return str(new_list).encode('utf-8')
docs: Format keyboard /command field.