def visit_VARCHAR(self, type_, **kw):
        if type_.length:
            return self._extend_string(
                type_, {}, type_.length % "VARCHAR(%d)")
        else:
            raise exc.CompileError(
                "VARCHAR requires a length on dialect %s" %
                self.dialect.name)
dataset/ETHPy150Open zzzeek/sqlalchemy/lib/sqlalchemy/dialects/mysql/base.py/MySQLTypeCompiler.visit_VARCHAR/swapped operands of `%`