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The official Python documentation describes
set.discard(elem)
as:and
set.remove(elem)
as:Hence, it is obvious that both the functions do the same work, but differ only with throwing an error for an absent key. As we already had the infrastructure for
set.remove
, it was easy to base and implementset.discard
on top of that.The idea is simple - utilize the same back-end function, but do not throw an error for
set.discard
.Working
The changed length and KeyError for
set.remove
prove the normal working ofset.discard
.Handling KeyError
set.discard
set.remove