[Tutor] How does [::-1] work?

[Intercodes]

Hello Everyone,

There was a query in this list regarding reversing a string and someone
suggested that [::-1] does that.

I tried that expression in my intepreter and various other combination but
still can't comprehend how the expression works. I could understand[:] ,
[n:] or  [:n] . But what meaning does it have in using two colons inside
array index while slicing?. A concise explanation would suppress my
curiosity.

Thank You.
--
Intercodes
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