code: def default_id(resource, method):
      """Default operation ID generator"""
      return "{0}_{1}".format(method, camel_to_dash(resource))
  
file_path: flask-restplus/flask_restplus/utils.py
imports: from __future__ import unicode_literals
  import re
  from copy import deepcopy
  from six import iteritems
  from ._http import HTTPStatus
label_desc: Use image node_id 3 for calling a global function with example usage: default_id(resource, method) and returns: str