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sortable

Sortable

Base class for sorting based self._sort_key

Source code in src/robot/utils/sortable.py 
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class Sortable:
    """Base class for sorting based self._sort_key"""

    _sort_key = NotImplemented

    def __test(self, operator, other, require_sortable=True):
        if isinstance(other, Sortable):
            return operator(self._sort_key, other._sort_key)
        if not require_sortable:
            return False
        raise TypeError("Cannot sort '%s' and '%s'."
                        % (type_name(self), type_name(other)))

    def __eq__(self, other):
        return self.__test(eq, other, require_sortable=False)

    def __lt__(self, other):
        return self.__test(lt, other)

    def __le__(self, other):
        return self.__test(le, other)

    def __gt__(self, other):
        return self.__test(gt, other)

    def __ge__(self, other):
        return self.__test(ge, other)

    def __hash__(self):
        return hash(self._sort_key)