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Print the display board
Write a function to printout a board.
Setup the board as a list, where indexes from 1-9 corresponds to the number on the board.
Therefore, we get a 3 by 3 board representation.
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Assign the markers to the players
Write a function that can take in a player input and assign their marker as 'X' or 'O'.
Think about using while loops to continually ask until you get a correct answer.
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Randomly choose the first player
Write a function that uses the random module to randomly decide which player goes first. You may want to lookup random.randint() Return a string of which player went first.
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Check whether the space is free or not
Write a function that returns a boolean indicating whether a space on the board is freely available.
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Ask the player for the next position
Write a function that asks for a player's next position (as a number 1-9) and then uses the function from step 4 to check if it's a free position. If it is, then return the position for later use.
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Assign the marker to the board as per the position provided by the player
Write a function that takes in the board list object, a marker ('X' or 'O'),
and a desired position (number 1-9) and assigns it to the board.
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Check Win conditions
Write a function that takes in a board and a mark (X or O) and then checks to see if that mark has won.
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Check if the board is full
Write a function that checks if the board is full and returns a boolean value. True if full, False otherwise.
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Ask the player, if he wants to replay
Write a function that asks the player if they want to play again and returns a boolean True if they do want to play again.