PyQt from py27 to py38

[Tomas Sobota]

A couple of ideas here:
https://stackoverflow.com/questions/54047757/unpickle-binary-file-to-text/54048296#54048296
Maybe you could take it from there?
Tom

On Tue, Oct 26, 2021 at 6:12 PM RoadrunnerWMC <roadrunnerwmc at gmail.com>
wrote:

> (Just adding this to the mailing list, if you don't mind)
>
> ---------- Forwarded message ---------
> From: Nicola Raffo <nicola.raffo at rulex.ai>
> Date: Tue, Oct 26, 2021 at 11:15 AM
> Subject: Re: PyQt from py27 to py38
> To: RoadrunnerWMC <roadrunnerwmc at gmail.com>
>
>
> Similar scenario here, I have to deal with some data stored with pickled
> PyQt4 objects. The pickletools method can be useful to "read" the pickled
> data, but I need a conversion from PyQt4 to PyQt5 data in order to be able
> to load the data in Python 3.8 and whitout a proper method to do it I can't
> depickle data in Python 3.8.
>
> Another idea could be to use the previous version of the code which still
> uses python 2.7 and to store them in another format, but this could take a
> long time.
>
> What I need is a tool that allows me to automatically read and open these
> data in Python 3.8
> ------------------------------
> *From:* RoadrunnerWMC <roadrunnerwmc at gmail.com>
> *Sent:* 26 October 2021 17:06
> *To:* Florian Bruhin <me at the-compiler.org>
> *Cc:* pyqt at riverbankcomputing.com <pyqt at riverbankcomputing.com>
> *Subject:* Re: PyQt from py27 to py38
>
> The pickletools method is at least doable for relatively simple pickles --
> I have an application that does exactly that because another developer made
> the less-than-wise decision to store pickled PyQt4 objects in user data
> files a long time ago, and now I have to support reading them forever. The
> main downside is that you have to make a lot of assumptions about the
> structure of the pickle data, ones which technically don't *need* to
> always be true, but *should* nevertheless be safe if your users are all
> using CPython and not manually messing with the generated pickle data for
> some reason.
>
> There is another option, too, which is to make a minimal fake "PyQt4"
> interface (just a few nearly-empty class stubs) and have pickle load using
> that. I chose the pickletools method because of the additional security
> benefits of avoiding using pickle.loads() on untrusted user data files.
>
> On Tue, Oct 26, 2021 at 8:58 AM Florian Bruhin <me at the-compiler.org>
> wrote:
>
> On Tue, Oct 26, 2021 at 11:47:40AM +0200, Florian Bruhin wrote:
> > The harder way is to somehow coerce pickle into giving you the "raw"
> > data without the PyQt object involved...
>
> I just learned there's 'pickletools' in the stdlib:
> https://docs.python.org/3/library/pickletools.html
> <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.python.org%2F3%2Flibrary%2Fpickletools.html&data=04%7C01%7Cnicola.raffo%40rulex.ai%7C74001822c1bd4a9803f308d998924bf9%7Ccb4c9caf154d430fade0c36c8af22d19%7C0%7C0%7C637708576448192165%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=rJY1OaBWAhzGQtPg9t%2BFsHUBVfL%2BkWiOBv%2BdLUt%2Bung%3D&reserved=0>
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> Using that, you could inspect the pickle manually and pick the data out
> of it somehow. Given how pickles are structured, not exactly
> straightfoward either, though.
>
> Florian
>
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