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.
code: def processoption(self, option):
      if self._processopt:
          if option.dest:
              self._processopt(option)
  
imports: import argparse
  import warnings
  import py
  import six
  from _pytest.config.exceptions import UsageError
label_desc: Use image node_id 2 for calling the Parser obj's underlying member method code with example usage: obj.processoption(option) without return types