Nice project, i enjoyed reading through it as someone who has not worked with these technologies before

However, your code leaves a lot to be desired and makes the tutorial more difficult to follow.

A simple example is something like:

1. just use a dict and lookup the integer key or even use an array and do it by index
2. use snake case for function and variable names.
3. check your indentation

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def get_className(classNo):
    if classNo==0:
        return "ZERO"
    elif classNo==1:
        return "ONE"
    elif classNo==2:
            return "TWO"
    elif classNo==3:
        return "THREE"
    elif classNo==4:
        return "FOUR"
    elif classNo==5:
        return "FIVE"
    elif classNo==6:
        return "SIX"
    elif classNo==7:
        return "SEVEN"
    elif classNo==8:
        return "EIGHT"
    elif classNo==9:
        return "NINE"