example optimization

[ghost]

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[astynax]

Thank you for your contribution but this example doesn't need to be simplified! Our course is targeted for absolute beginners so every example shows not optimal solution but the simple one.
This particular example should teach the student how to use long chains of if-elif - exactly in this repetative manner "check this than that".

BTW, your solution is sub-optimal and can be improved even more:

def is_arguments_for_substr_correct(string, index, length):
    return index >= 0 and index + length < len(string)

😉