Reversing an iterable using slicing, likle [::-1], before passing it to set(), sorted(), or
reversed() is unnecessary and inefficient. The slicing operation creates a new copy of the iterable in reverse order, which is not needed
for the following reasons:
-
set(): The order of elements in a set is inherently undefined, so reversing the iterable before creating the set has no effect on
the final set, and it introduces unnecessary computation.
-
sorted(): The sorted() function has a reverse parameter that provides a more efficient way to sort in
descending order. Using slicing to reverse the result of sorted() is less efficient and less readable.
-
reversed(): Applying reversed() twice on the same iterable effectively returns the original iterable, if it supports
direct iteration. If the iterable is a one-time iterator, then you will need to create an iterator from the original iterable using
iter(iterable). Using slicing adds unnecessary overhead.
