[python] Understanding string reversal via slicing

It's basic step notation, consider the functionality of:

a[2:4:2]

What happens is the index is sliced between position 2 and 4, what the third variable does is it sets the step size starting from the first value. In this case it would return a[2], since a[4] is an upper bounds only two values are return and no second step takes place. The (-) minus operator simply reverses the step output.

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