[Tutor] slicing a string

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Hi guys,

Continuing my Python learning, I came across an exercise which asks me
to take a string and reverse it.

I understand that there is a function to do this i.e mytext.reverse()

I imagine that the exercise author would rather I did this the hard
way however. ;-)

Assuming that mytext is "test", I've found that mytext[-1:-4:-1]
doesn't work (as I expected it to) but that mytext[::-1] does.

While that's fine, I just wondered why mytext[-1:-4:-1] doesn't work?

Thanks again,

Chris