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First solution in Clear category for Friends by Degusto
class Friends:
def __init__(self, connections):
self.connections = [list(sorted(connection)) for connection in connections]
def add(self, connection):
if sorted(connection) in self.connections:
return False
else:
self.connections.append(list(sorted(connection)))
return True
def remove(self, connection):
if sorted(connection) in self.connections:
self.connections.remove(list(sorted(connection)))
return True
else:
return False
def names(self):
names = [x for connection in self.connections for x in connection]
return set(names)
def connected(self, name):
connected_names = []
for connection in self.connections:
if connection[0] == name:
connected_names.append(connection[1])
if connection[1] == name:
connected_names.append(connection[0])
return set(connected_names)
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. 17, 2015
