Your solution is excellent but not clear cause I hate this syntax: if succ == 3: return True else: return False More

The same solution not need import operator just use lambda function :) More

Too many imbrications. I can't understand easy when I read your code I think it's for creative section as you said in your last comment. Plz don't angry to me. It's just my opinion. :) More

I note you used **date** object and not **datetime** object for sure it's not an accident :) More

I think use **set** is more efficient. I like!!! More