class_docstr: Provide an opt-producer and CLI argument parser.
  
  Pseudo-extension of ``argparse`` which sets a number of parameters
  for the ParlAI framework. More options can be added specific to other
  modules by passing this object and calling ``add_arg()`` or
  ``add_argument()`` on it.
  
  For an example, see ``parlai.core.dict.DictionaryAgent.add_cmdline_args``.
  
  :param add_parlai_args:
      (default True) initializes the default arguments for ParlAI
      package, including the data download paths and task arguments.
  :param add_model_args:
      (default False) initializes the default arguments for loading
      models, including initializing arguments from that model.
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code: def _handle_single_dash_parsearg(self, args, actions):
      if _sys.version_info >= (3, 8, 0):
          newargs = []
          for arg in args:
              darg = f"-{arg}"
              if (
                  arg.startswith("-")
                  and not arg.startswith("--")
                  and darg in actions
              ):
                  newargs.append(darg)
              else:
                  newargs.append(arg)
          return newargs
      else:
          return args
  
imports: import argparse
  import importlib
  import os
  import sys
  import datetime
  import parlai
  import parlai.utils.logging
  from parlai.core.build_data import modelzoo_path
  from parlai.core.loader import load_teacher_module, load_agent_module, load_world_module
  from parlai.tasks.tasks import ids_to_tasks
  from parlai.core.opt import Opt
  from parlai.utils.io import PathManager
  from typing import List, Optional
label_desc: Use image node_id 15 for calling the ParlaiParser obj's underlying member method code with example usage: obj._handle_single_dash_parsearg(args, actions) and returns: newargs, args