TypeError: sequence item 0: expected string, NoneType found

Question

I\'m trying to improve a game of battleships. The original version works fine with no errors. I have written code to help overcome the fact that the first version places the shi

Answer 1

Your DisplayChar function does not have a default value. This would do no harm if you'd be handling all possible cases for x, but apparently you're not. Try

def DisplayChar(x):
    if x == 0: 
        return '?'
    elif x == 2:
        return 'X'
    elif x == 4:
        return '*'
    else:
        return ' '

but this will probably yield blank strings where you don't expect them.

Generally, I'd recommend going through a good Python tutorial first. All of your above code can be greatly simplified.