docs: def all_dict_combinations(varied_dict):
      """
      all_dict_combinations
  
      Args:
          varied_dict (dict):  a dict with lists of possible parameter settings
  
      Returns:
          list: dict_list a list of dicts correpsonding to all combinations of params settings
  
      CommandLine:
          python -m utool.util_dict --test-all_dict_combinations
  
      Example:
          >>> # ENABLE_DOCTEST
          >>> from utool.util_dict import *  # NOQA
          >>> import utool as ut
          >>> varied_dict = {'logdist_weight': [0.0, 1.0], 'pipeline_root': ['vsmany'], 'sv_on': [True, False, None]}
          >>> dict_list = all_dict_combinations(varied_dict)
          >>> result = str(ut.repr4(dict_list))
          >>> print(result)
          [
              {'logdist_weight': 0.0, 'pipeline_root': 'vsmany', 'sv_on': True},
              {'logdist_weight': 0.0, 'pipeline_root': 'vsmany', 'sv_on': False},
              {'logdist_weight': 0.0, 'pipeline_root': 'vsmany', 'sv_on': None},
              {'logdist_weight': 1.0, 'pipeline_root': 'vsmany', 'sv_on': True},
              {'logdist_weight': 1.0, 'pipeline_root': 'vsmany', 'sv_on': False},
              {'logdist_weight': 1.0, 'pipeline_root': 'vsmany', 'sv_on': None},
          ]
      """
      #tups_list = [[(key, val) for val in val_list]
      #             if isinstance(val_list, (list, tuple))
      #             else [(key, val_list)]
      #             for (key, val_list) in six.iteritems(varied_dict)]
      tups_list = [[(key, val) for val in val_list]
                   if isinstance(val_list, (list))
                   #if isinstance(val_list, (list, tuple))
                   else [(key, val_list)]
                   for (key, val_list) in iteritems_sorted(varied_dict)]
      dict_list = [dict(tups) for tups in it.product(*tups_list)]
      #dict_list = [{key: val for (key, val) in tups} for tups in it.product(*tups_list)]
      #from collections import OrderedDict
      #dict_list = [OrderedDict([(key, val) for (key, val) in tups]) for tups in it.product(*tups_list)]
      return dict_list