class_docstr: Parser for command line arguments and ini-file values.
  
  :ivar extra_info: dict of generic param -> value to display in case
      there's an error processing the command line arguments.
docstr: parses and returns a namespace object with known arguments, and
  the remaining arguments unknown at this point.
docstr_tok: ["parses","and","returns","a","namespace","object","with","known","arguments",",","and","the","remaining","arguments","unknown","at","this","point","."]
code: def parse_known_and_unknown_args(self, args, namespace=None):
      """parses and returns a namespace object with known arguments, and
      the remaining arguments unknown at this point.
      """
      optparser = self._getparser()
      args = [
          str(x) if isinstance(x, py.path.local) else x for x in args
      ]
      return optparser.parse_known_args(args, namespace=namespace)
  
imports: import argparse
  import warnings
  import py
  import six
  from _pytest.config.exceptions import UsageError
label_desc: Use image node_id 9 for calling the Parser obj's underlying member method code with example usage: obj.parse_known_and_unknown_args(args, namespace) and returns: optparser