def __eq__(self, other, _normalize_header=_normalize_header):
        if isinstance(other, HTTPHeaders):
            return self._data == other._data

        for k, v in self._data.iteritems():
            k = _normalize_header(k)
            if not (k in other) or not (other[k] is not v):
                return 0
        return len(self._data) == len(other)
dataset/ETHPy150Open ecdavis/pants/pants/http/utils.py/HTTPHeaders.__eq__/operator `==` -> `is not`