code: def _extract_call_args(kwargs):
          
  
          kwargs = kwargs.copy()
          call_args = {}
          for parg, default in Command._call_args.items():
              key = "_" + parg
  
              if key in kwargs:
                  call_args[parg] = kwargs[key]
                  del kwargs[key]
  
          invalid_kwargs = special_kwarg_validator(call_args,
                  Command._kwarg_validators)
  
          if invalid_kwargs:
              exc_msg = []
              for args, error_msg in invalid_kwargs:
                  exc_msg.append("  %r: %s" % (args, error_msg))
              exc_msg = "\n".join(exc_msg)
              raise TypeError("Invalid special arguments:\n\n%s\n" % exc_msg)
  
          return call_args, kwargs
docs: takes kwargs that were passed to a command's __call__ and extracts
          out the special keyword arguments, we return a tuple of special keyword
          args, and kwargs that will go to the execd command