code: def _addoption(self, *optnames, **attrs):
      option = Argument(*optnames, **attrs)
      self._addoption_instance(option, shortupper=True)
  
imports: import argparse
  import warnings
  import py
  import six
  from _pytest.config.exceptions import UsageError
label_desc: Use image node_id 3 for calling the OptionGroup obj's underlying member method code with example usage: obj._addoption() without return types