code: def validate_digit(value, start, end):
      """validate if a digit is valid"""
      if (
          not str(value).isdigit()
          or int(value) < start
          or int(value) > end
      ):
          raise ValueError(
              "value (%s) must be a digit from %s to %s"
              % (value, start, end)
          )
  
imports: import json
  import os
  from .rest_utils import rest_put, rest_post, rest_get, check_rest_server_quick, check_response
  from .url_utils import experiment_url, import_data_url
  from .config_utils import Config, Experiments
  from .common_utils import get_json_content, print_normal, print_error, print_warning
  from .nnictl_utils import get_experiment_port, get_config_filename, detect_process
  from .launcher_utils import parse_time
  from .constants import REST_TIME_OUT, TUNERS_SUPPORTING_IMPORT_DATA, TUNERS_NO_NEED_TO_IMPORT_DATA
label_desc: Use image node_id 1 for calling a global function with example usage: validate_digit(value, start, end) without return types