示例#1
0
 def get_str(self):
     """Return the instance's string representation."""
     if len(self.data) == 1:
         return str(_get_single_iter_elem(self.data))
     else:
         unsorted_strings = [str(elem) for elem in self.data]
         return '({elems})'.format(elems=' U '.join(elem for elem in sorted(unsorted_strings)))
示例#2
0
    def get_ground_set(self) -> _structure.Structure:
        """Return the ground Multiset of the lowest-level algebra of this :class:`Multiset`."""
        if len(self.data) == 0:
            return _structure.Structure()

        elements_ground_set = _structure.Union(elem.get_ground_set() for elem in self.data)
        if len(elements_ground_set.data) == 1:
            return _structure.PowerSet(_structure.CartesianProduct(
                _get_single_iter_elem(elements_ground_set.data), _structure.GenesisSetN()))
        else:
            return _structure.PowerSet(_structure.CartesianProduct(
                elements_ground_set, _structure.GenesisSetN()))
示例#3
0
    def is_same(self, other: Structure) -> bool:
        """Return ``True`` if ``self`` is structurally equivalent to ``other``.

        :param other: Must be an instance of `Structure`.
        :return: ``True`` if ``self`` is structurally equivalent to ``other``.
        """
        assert isinstance(other, Structure)
        if isinstance(other, Union):
            return self.data == other.data
        else:
            if len(self.data) == 1:
                # Compare the one element against 'other'.
                return _get_single_iter_elem(self.data).is_same(other)
            else:
                # self is a 'real' union, so the 'other' must also be a union.
                return False