for i in list[::-1]: ...
The third parameter is called stride. It is optional and defaults to 1 when not specified. It specifies the amount to increment by.
for i in range(0, 10, 2): print(i) 0 2 4 6 8 for i in range(10, 0, -2): print(i) 10 8 6 4 2
In your example you use it with a list slice, the same principle applies.
Ohh… Is there a reason why the start and end parameters are omitted?
That’s shorthand for saying you want the entire list. You could input the endpoints explicitly too.
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