!rant
I am teaching some friends python, so i would you comment here challenges to do in it (eg. Python TicTacToe). All difficulties would be appreciated.

Ideas Bag

AI

The game of 21/pontoon is a fun one, a couple of lovely edge cases there.

Make a memory container to store different types of data.

#DataStructures

A simple chat app could be a good project for a couple of weeks. Make it have logins, contacts and a list of chats that you can easily store in text files. It's a really easy to scale project, you can complicate or simplify it as much as you want.

If you're looking for programming exercises, however, rossetacode.org is a good place to find little challenges that take you no more than a couple of hours. It's quite good if you're just starting with programming in general, as it makes you think and really figure out how the logic of programing works.

Maybe try a password cracker xD

Have them make a hi/low guessing game. It should store a random integer as the correct number, ask for guesses, and tell the user if their guess is too low or too high. Bonus: have the program print out the current highest and lowest guesses. If youre up to it you can give users a certain amount of cash to start with, each guess takes some money, and each win gives some money.