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strange bug in connections solution in Clear category for Friends by pskrdx
class Friends:
def __init__(self, connections):
self.connections = set(frozenset(i) for i in connections)
def add(self, connection):
if connection not in self.connections:
self.connections.add(frozenset(connection))
return True
else:
return False
def remove(self, connection):
if connection in self.connections:
self.connections.remove(connection)
return True
else:
return False
def names(self):
return set(sum([list(i)for i in self.connections],[]))
def connected(self, name):
s = set(sum([list(i)for i in self.connections if name in i],[]))
s1 = set()
s1.add(name)
return s-s1
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. 26, 2015
