def parseImpl( self, instring, loc, doActions=True ):
        maxExcLoc = -1
        maxException = None
        matches = []
        for e in self.exprs:
            try:
                loc2 = e.tryParse( instring, loc )
            except ParseException as err:
                err.__traceback__ = None
                if err.loc > maxExcLoc:
                    maxException = err
                    maxExcLoc = err.loc
            except __HOLE__:
                if len(instring) > maxExcLoc:
                    maxException = ParseException(instring,len(instring),e.errmsg,self)
                    maxExcLoc = len(instring)
            else:
                # save match among all matches, to retry longest to shortest
                matches.append((loc2, e))

        if matches:
            matches.sort(key=lambda x: -x[0])
            for _,e in matches:
                try:
                    return e._parse( instring, loc, doActions )
                except ParseException as err:
                    err.__traceback__ = None
                    if err.loc > maxExcLoc:
                        maxException = err
                        maxExcLoc = err.loc

        if maxException is not None:
            maxException.msg = self.errmsg
            raise maxException
        else:
            raise ParseException(instring, loc, "no defined alternatives to match", self)
dataset/ETHPy150Open pypa/pip/pip/_vendor/pyparsing.py/Or.parseImpl