On Wed, Dec 29, 2021 at 7:25 PM Marco Sulla
wrote:
>
> I noticed that now freelists in dict use _Py_dict_state. I suppose
> this is done for thread safety.
>
Some core-dev are working on per-interpreter GIL. But it is not done yet.
So you don't need to follow it soon. Your extension module will w
On Wed, 29 Dec 2021 at 18:33, iMath wrote:
> But I found the size of the file of the shelve data didn't change much, so I
> guess the data are still in it , I just wonder any way to recover my data.
I agree with Barry, Chris and Avi. IMHO your data is lost. Unpickling
it by hand is a harsh work
I am not an expert on the topic but my first reaction is it depends on how
the data is corrupted and we do not know that. So I am addressing a more
general concept here.
Some algorithms break if a single byte or even bit changes and nothing
beyond that point makes sense. Many encryption techniques
On Thu, Dec 30, 2021 at 4:32 AM iMath wrote:
>
> > You have lost the data in that case.
>
> But I found the size of the file of the shelve data didn't change much, so I
> guess the data are still in it , I just wonder any way to recover my data.
Unless two conflicting versions got interleaved, i
> You have lost the data in that case.
But I found the size of the file of the shelve data didn't change much, so I
guess the data are still in it , I just wonder any way to recover my data.
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On Wed, 29 Dec 2021 at 12:11, Dieter Maurer wrote:
>
> Marco Sulla wrote at 2021-12-29 11:59 +0100:
> >On Wed, 29 Dec 2021 at 09:12, Dieter Maurer wrote:
> >> `MutableMapping` is a so called abstract base class (--> `abc`).
> >>
> >> It uses the `__subclass_check__` (and `__instance_check__`) of
Marco Sulla wrote at 2021-12-29 11:59 +0100:
>On Wed, 29 Dec 2021 at 09:12, Dieter Maurer wrote:
>> `MutableMapping` is a so called abstract base class (--> `abc`).
>>
>> It uses the `__subclass_check__` (and `__instance_check__`) of
>> `abc.ABCMeta` to ensure `issubclass(dict, MutableMapping)`.
>
On Wed, 29 Dec 2021 at 09:12, Dieter Maurer wrote:
> `MutableMapping` is a so called abstract base class (--> `abc`).
>
> It uses the `__subclass_check__` (and `__instance_check__`) of
> `abc.ABCMeta` to ensure `issubclass(dict, MutableMapping)`.
> Those can be customized by overriding `MutableMap
I noticed that now freelists in dict use _Py_dict_state. I suppose
this is done for thread safety.
I would implement it also for a C extension that uses CPython < 3.10.
How can I achieve this?
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On Wed, 29 Dec 2021 at 10:06, Dieter Maurer wrote:
>
> Are you sure you need to implement your type in C at all?
It's already implemented, and, in some cases, is faster than dict:
https://github.com/Marco-Sulla/python-frozendict#benchmarks
PS: I'm doing a refactoring that speeds up creation eve
On Wed, Dec 29, 2021 at 8:07 PM Dieter Maurer wrote:
>
> Marco Sulla wrote at 2021-12-29 09:29 +0100:
> >On second thought, I think I'll do this for the pure py version. But I
> >will definitely not do this for the C extension
>
> Are you sure you need to implement your type in C at all?
>
> I mad
Marco Sulla wrote at 2021-12-29 09:29 +0100:
>On second thought, I think I'll do this for the pure py version. But I
>will definitely not do this for the C extension
Are you sure you need to implement your type in C at all?
I made a small `timeit` test:
```
>>> class cd(dict): pass
...
>>> timeit
On second thought, I think I'll do this for the pure py version. But I
will definitely not do this for the C extension, since it's anyway
strange that an immutable mapping inherits from a mutable one! I've
done it in the pure py version only for a matter of speed.
On Wed, 29 Dec 2021 at 09:24, Mar
On Wed, 29 Dec 2021 at 09:12, Dieter Maurer wrote:
>
> Marco Sulla wrote at 2021-12-29 08:08 +0100:
> >On Wed, 29 Dec 2021 at 00:03, Dieter Maurer wrote:
> >> Why do you not derive from `dict` and override its mutating methods
> >> (to raise a type error after initialization is complete)?
> >
> >
Cool, thanks!
On Wed, 29 Dec 2021 at 07:10, Inada Naoki wrote:
>
> You can use --upgrade-deps option. My alias is:
>
> alias mkvenv='python3 -m venv --upgrade-deps --prompt . venv'
>
> On Wed, Dec 29, 2021 at 4:55 AM Marco Sulla
> wrote:
> >
> > I think it's very boring that, after creating a
Marco Sulla wrote at 2021-12-29 08:08 +0100:
>On Wed, 29 Dec 2021 at 00:03, Dieter Maurer wrote:
>> Why do you not derive from `dict` and override its mutating methods
>> (to raise a type error after initialization is complete)?
>
>I've done this for the pure py version, for speed. But in this way
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