Because `frozenset.copy()` doesn't copy the frozenset so `frozenset.copy()` is useless and should be deprecated and removed in the future.

[hyperkai]

Feature or enhancement

Proposal:

frozenset.copy() doesn't copy the frozenset to avoid wasting memory according to the post as shown below:

import copy

A = frozenset([0, 1, 2])

B = A.copy()

print(A is B)
# True

Now, because frozenset.copy() doesn't copy the frozenset so frozenset.copy() is useless and should be deprecated and removed in the future.

Others also think frozenset.copy() is useless according to the post.

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

[terryjreedy]

In general, feature requests should be first discussed on discuss.python.org. In this case, the proposal should note that tuple.copy does not exist, but consider why frozenset.copy was included.

[StanFromIreland]

Since frozenset is a builtin, this proposal would require a PEP.

[skirpichev]

This is another occurrence of closed issue.

@hyperkai, please don't reopen such issues. Feel free to add reasons in the old discussion thread.