[Python-ideas] Re: Fwd: Re: Experimenting with dict performance, and an immutable dict

On Tue, Sep 15, 2020 at 5:08 AM Marco Sulla <Marco.Sulla.Python@gmail.com> wrote:

1. How can we check the size of an object only if it's an iterable using the Python C API?

There is no good way. Additionally, we need to know distinct count if we want to preallocate hash table. For example, `len(dict(["foo"]*1000))` is 1, not 1000.

2. Why, in your opinion, no relevant speedup was done?

We have "one big resize" logic in dict_merge already. And I use dummy empty dictkeys for new empty dict. So we don't allocate any temporary, intermediate dictkey object. Bests, -- Inada Naoki <songofacandy@gmail.com>