Python 3 reference · Set Methods

Python Set copy() Method

Return a shallow copy of the set: a new set with the same elements, which you can change without affecting the original.

Syntax

set.copy()

A new set.

Copy before changingTry it yourself

a = {1, 2}
b = a.copy()
b.add(3)
print(sorted(a), sorted(b))

Output

[1, 2] [1, 2, 3]

Equal but a different objectTry it yourself

a = {1, 2}
print(a.copy() == set(a), a.copy() is a)

Output

True False

Version	Change
Python 3.0	Added

frozenset() · Create an immutable set: unique items that can't be added or removed, so it is hashable and can be a dict key.
Python Sets · tutorial