On Wed, Feb 24, 2021, at 02:59, Marco Sulla wrote: > On Wed, 24 Feb 2021 at 06:29, Random832 <random...@fastmail.com> wrote: > > I was surprised, though, to find that you can't remove items directly from > > the key set, or in general update it in place with &= or -= (these > > operators work, but give a new set object). > > This is because they are a view. Changing the key object means you > will change the underlying dict. Probably not that you want or expect.
Why wouldn't it be what I want or expect? Java allows exactly this [and it's the only way provided to, for example, remove all keys matching a predicate in a single pass... an operation that Python sets don't support either] > You can just "cast" them into a "real" set object. > > There was a discussion to implement the whole Set interface for dicts. > Currently, only `|` is supported. -- https://mail.python.org/mailman/listinfo/python-list
