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lambda solution in Creative category for Friends by jcg
class Friends(set):
__init__ = lambda self, connections: self.update(map(frozenset, connections))
add = lambda self, connection: not(connection in self or super().add(frozenset(connection)))
remove = lambda self, connection: connection in self and not super().discard(frozenset(connection))
names = lambda self: set.union(*map(set,self))
connected = lambda self, name: set().union(*filter(lambda x:name in x, self))-{name}
if __name__ == '__main__':
#These "asserts" using only for self-checking and not necessary for auto-testing
letter_friends = Friends(({"a", "b"}, {"b", "c"}, {"c", "a"}, {"a", "c"}))
digit_friends = Friends([{"1", "2"}, {"3", "1"}])
assert letter_friends.add({"c", "d"}) is True, "Add"
assert letter_friends.add({"c", "d"}) is False, "Add again"
assert letter_friends.remove({"c", "d"}) is True, "Remove"
assert digit_friends.remove({"c", "d"}) is False, "Remove non exists"
assert letter_friends.names() == {"a", "b", "c"}, "Names"
assert letter_friends.connected("d") == set(), "Non connected name"
assert letter_friends.connected("a") == {"b", "c"}, "Connected name"
Nov. 15, 2014
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