def _add_label(self, d):
        #debug("%s", d)
        if self._current_label not in None:
            if not self._current_label["__taken"]:
                self._current_label["__taken"] = True
                d["__label"] = self._current_label
dataset/ETHPy150Open deanhiller/databus/webapp/play1.3.x/samples-and-tests/i-am-a-developer/mechanize/ClientForm.py/_AbstractFormParser._add_label/operator `is not` -> `not in`