You can't modify an existing set with a comprehension. But you can create a new one. Set comprehension the prime purpose is to create new set.
Set comprehensions using the {} syntax only exist in Python 3. Before that, you'll have to use the set() function to create and work with sets. You might guess, therefore, that one of the best uses of a set is to eliminate duplicates.
In fact, this is one of the most basic forms of set comprehension. Given a list, we can duplicate it as a list with a simple list comprehension like this:
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Set Comprehension
Likewise, of course, the comprehension must result in a valid set. A set cannot contain multiple entries of the same value. Like the dictionary, Python is polite about this.
If you try to add values to the set that are already there, it will replace the old one with the new one.
Curling brackets- Set comprehension
In fact, this is one of the most basic forms of set comprehension. Given a list, we can duplicate it as a list with a simple list comprehension like this:
List logic
if we change the list comprehension to a set comprehension, we get the same result, but as a set. That means without duplicates.list_copy = [x for x in original_list]
Set comprehension
my_list_with_dupes = [1,2,1,2,3,4,1,2,3,4,5,6,7,1,2,3]
my_set_without_dupes = {x for x in my_list_with_dupes}
print(my_set_without_dupes)
{1, 2, 3, 4, 5, 6, 7}