from collections.abc import MutableSet

__author__ = 'Horacio Hoyos'
__copyright__ = 'Copyright , Kinori Technologies'


class MofSet(MutableSet):

    def __init__(self, iterable):
        self._set = set(iterable)

    def __contains__(self, item):
        return item in self._set

    def __iter__(self):
        return self._set.__iter__()

    def __len__(self):
        return len(self._set)

    def add(self, item):
        self._set.add(item)

    def discard(self, item):
        self._set.discard(item)

    def intersection(self, other):
        return self._set.intersection(other)

# Tests based on Python's test_set.py
def call_and():
    word = 'simsalabim'
    otherword = 'madagascar'
    myset = MofSet(word)
    i = myset.intersection(otherword)
    assert myset & set(otherword) == i
    assert myset & frozenset(otherword) == i
    try:
        myset & otherword
    except TypeError:
        pass
    else:
        print("s&t did not screen-out general iterables")


if __name__ == '__main__':
    call_and()