[Tutor] Step Value

[Vincent Balmori]

"From Steven D'Aprono:
* change the ask_number function
to accept a fourth argument;
* make it optional rather than
required;
* give it a sensible default
value;
* within the function, that value
must then be passed to range
"

Okay, I think I understand it better for the quesiton:
"Improve the function ask_number() so that the function can be called with a step value. Make the default value of step 1." Here is the improved function and the human_move function that calls it later on. The thing I am unaware of doing is making the step value 'optional rather than required' though.

def ask_number(question, low, high, step):
    """Ask for a number within a range."""
    step = 1
    response = None
    while response not in range(low, high, step):
        response = int(input(question))
    return response

def human_move(board, human):
    """Get human move."""  
    legal = legal_moves(board)
    move = None
    while move not in legal:
        move = ask_number("Where will you move? (0 - 8):", 0, NUM_SQUARES, 1)
        if move not in legal:
            print("\nThat square is already occupied, foolish human.  Choose another.\n")
    print("Fine...")
    return move    
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