Tictactoe or Noughts and Crosses is a two player, they take turns, game where the only rule to win is to draw the same sign vertically, horizontally or diagonally on a three by three grid.

We will build the program using 5 modules:

1. The grid printer
2. The input getter
3. The switch player
4. The winner determiner
5. The game developer

The above list can be daunting but no worries..I was too, hehe.

First, the grid printer is a function that uses a dictionary to print out an initial frame where the players will be placing their signs.

Second, the input getter is where the terminal will ask a player to input a sign, imposing some restriction to not cause an error in the game like the input must be a number between 1 - 3.

Third, the switch player is the most simple function of them all, it just changes turns between players.

Fourth, the winner determiner is like a filter to check horizontally, vertically and diagonally if one of the player got three consecutive signs.

Finally, the game developer relates the four functions described and initializes the game.