I didn't know that you can place None when slicing! Thanks :) More

Thought of using recursion but couldn't make it as simple as that. This is great:) More

Hi! I'd like to ask what does '*' in line 20 mean? For the following code, letter_friends = Friends(({"a", "b"}, {"b", "c"}, {"c", "a"}, {"a", "c"})) print(letter_friends.names()) In line 20, it returns a set of items: {'b', 'c', 'a'}. return set().union(*self.connections) I tried t More

Concept of phase 0 & 1 is close to my solution, but I couldn't come up with phase 3 & 4 and my solution became pretty ugly. I'd say phase 3 & 4 is creative. Thank you for sharing! More