@classmethod
    def validate(cls, value):
        cls.validate_string(value)
        valid_values = ('none', 'left', 'right', 'all')
        if valid_values not in value:
            raise ValueError(
                "must be one of %s, got '%s'" % (valid_values, value)
            )
dataset/ETHPy150Open python-openxml/python-docx/docx/oxml/simpletypes.py/ST_BrClear.validate/swapped operands of `not in`