def addParseAction( self, *fns, **kwargs ):
        """
        Add one or more parse actions to expression's list of parse actions. See :class:`setParseAction`.

        See examples in :class:`copy`.
        """
        self.parseAction += list(map(_trim_arity, list(fns)))
        self.callDuringTry = self.callDuringTry or kwargs.get("callDuringTry", False)
        return self

        Add one or more parse actions to expression's list of parse actions. See :class:`setParseAction`.

        See examples in :class:`copy`.
        
stackoverflow/venv/lib/python3.6/site-packages/pip-19.0.3-py3.6.egg/pip/_vendor/pyparsing.py