def clean(self, value):
        if not value:
            return 0

        # Assume an iterable which contains an item per flag that's enabled
        result = BitHandler(0, [k for k, v in self.choices])
        for k in value:
            try:
                setattr(result, str(k), True)
            except __HOLE__:
                raise ValidationError('Unknown choice: %r' % (k,))
        return int(result)
dataset/ETHPy150Open unlimitedlabs/orchestra/orchestra/accounts/bitformfield.py/BitFormField.clean