def preParse( self, instring, loc ):
        if self.ignoreExprs:
            loc = self._skipIgnorables( instring, loc )

        if self.skipWhitespace:
            wt = self.whiteChars
            instrlen = len(instring)
            while loc < instrlen and wt in instring[loc]:
                loc += 1

        return loc
dataset/ETHPy150Open Exa-Networks/exabgp/lib/exabgp/dep/pyparsing.py/ParserElement.preParse/swapped operands of `in`