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List: pykde
Subject: Re: PyQt from py27 to py38
From: Nicola Raffo <nicola.raffo () rulex ! ai>
Date: 2021-10-27 9:19:48
Message-ID: DM6PR19MB255594D5DE1948080089688DFE859 () DM6PR19MB2555 ! namprd19 ! prod ! outlook ! com
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Hi Damien,
I have tried something similar in the past days but it seems not working to directly \
convert objects from PyQt4->PyQt5.
However, it has some good tips that I could partially use.
Thank you for you help.
Nicola
________________________________
From: Damien Elmes <pyqt@ankiweb.net>
Sent: 27 October 2021 09:55
Cc: pyqt <pyqt@riverbankcomputing.com>
Subject: Re: PyQt from py27 to py38
Here is an example of how we do it for PyQt5→PyQt6:
https://github.com/ankitects/anki/blob/036d04a7b1514fde0018280a79e98066275dae9c/qt/aqt \
/profiles.py#L159<https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgi \
thub.com%2Fankitects%2Fanki%2Fblob%2F036d04a7b1514fde0018280a79e98066275dae9c%2Fqt%2Fa \
qt%2Fprofiles.py%23L159&data=04%7C01%7Cnicola.raffo%40rulex.ai%7C1f16bbca75e4467de4d50 \
8d9991f45ef%7Ccb4c9caf154d430fade0c36c8af22d19%7C0%7C0%7C637709181878857049%7CUnknown% \
7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=CruPvq4y86AOAUW%2BQQSdroPgWNRC2yJ6q%2FNQ6h%2FP6ws%3D&reserved=0>
You might be able to adapt it for PyQt4 as well. In our case we were incorrectly \
storing the pickled data back in the Python 2 days, so couldn't safely bring it into \
PyQt5.
On Wed, Oct 27, 2021 at 3:07 AM Tomas Sobota <tom@sobota.net<mailto:tom@sobota.net>> \
wrote: A couple of ideas here:
https://stackoverflow.com/questions/54047757/unpickle-binary-file-to-text/54048296#540 \
48296<https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstackoverflow. \
com%2Fquestions%2F54047757%2Funpickle-binary-file-to-text%2F54048296%2354048296&data=0 \
4%7C01%7Cnicola.raffo%40rulex.ai%7C1f16bbca75e4467de4d508d9991f45ef%7Ccb4c9caf154d430f \
ade0c36c8af22d19%7C0%7C0%7C637709181878857049%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAw \
MDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=hETVSCuk%2BbQ994nx30wq2Xoq2XfH%2FVBbfIEMPsB5e94%3D&reserved=0>
Maybe you could take it from there?
Tom
On Tue, Oct 26, 2021 at 6:12 PM RoadrunnerWMC \
<roadrunnerwmc@gmail.com<mailto:roadrunnerwmc@gmail.com>> wrote: (Just adding this to \
the mailing list, if you don't mind)
---------- Forwarded message ---------
From: Nicola Raffo <nicola.raffo@rulex.ai<mailto:nicola.raffo@rulex.ai>>
Date: Tue, Oct 26, 2021 at 11:15 AM
Subject: Re: PyQt from py27 to py38
To: RoadrunnerWMC <roadrunnerwmc@gmail.com<mailto:roadrunnerwmc@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@gmail.com<mailto:roadrunnerwmc@gmail.com>>
Sent: 26 October 2021 17:06
To: Florian Bruhin <me@the-compiler.org<mailto:me@the-compiler.org>>
Cc: pyqt@riverbankcomputing.com<mailto:pyqt@riverbankcomputing.com> \
<pyqt@riverbankcomputing.com<mailto:pyqt@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@the-compiler.org<mailto:me@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=0 \
4%7C01%7Cnicola.raffo%40rulex.ai%7C1f16bbca75e4467de4d508d9991f45ef%7Ccb4c9caf154d430f \
ade0c36c8af22d19%7C0%7C0%7C637709181878867044%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAw \
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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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[Attachment #3 (text/html)]
<html>
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<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} \
</style> </head>
<body dir="ltr">
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; \
color: rgb(0, 0, 0);"> Hi Damien,</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; \
color: rgb(0, 0, 0);"> <br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; \
color: rgb(0, 0, 0);"> I have tried something similar in the past days but it seems \
not working to directly convert objects from PyQt4->PyQt5.</div> <div \
style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: \
rgb(0, 0, 0);"> <br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; \
color: rgb(0, 0, 0);"> However, it has some good tips that I could partially \
use.</div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: \
12pt; color: rgb(0, 0, 0);"> <br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; \
color: rgb(0, 0, 0);"> Thank you for you help.</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; \
color: rgb(0, 0, 0);"> <br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; \
color: rgb(0, 0, 0);"> Nicola</div>
<div id="appendonsend"></div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" \
style="font-size:11pt" color="#000000"><b>From:</b> Damien Elmes \
<pyqt@ankiweb.net><br> <b>Sent:</b> 27 October 2021 09:55<br>
<b>Cc:</b> pyqt <pyqt@riverbankcomputing.com><br>
<b>Subject:</b> Re: PyQt from py27 to py38</font>
<div> </div>
</div>
<div>
<div dir="ltr">Here is an example of how we do it for PyQt5→PyQt6:
<div><br>
</div>
<div><a href="https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub \
.com%2Fankitects%2Fanki%2Fblob%2F036d04a7b1514fde0018280a79e98066275dae9c%2Fqt%2Faqt%2 \
Fprofiles.py%23L159&data=04%7C01%7Cnicola.raffo%40rulex.ai%7C1f16bbca75e4467de4d50 \
8d9991f45ef%7Ccb4c9caf154d430fade0c36c8af22d19%7C0%7C0%7C637709181878857049%7CUnknown% \
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originalsrc="https://github.com/ankitects/anki/blob/036d04a7b1514fde0018280a79e98066275dae9c/qt/aqt/profiles.py#L159" \
shash="qF6afMfluntOUOneGmNjTROMgi9fjclk31pq+24iXpzxT1LEbyAMjxhkfNHg6JXfaVmiN9vYCdDIQrZ \
53HXJyuMyAoRua4qmlWRhhkUg4GczCnd8dr3JcaUBaVip7wJ6NQlQ9fHk8cOUO77Z4lLd76e1Y2zBHw+JD3A6HNtjoVY=" \
target="_blank">https://github.com/ankitects/anki/blob/036d04a7b1514fde0018280a79e98066275dae9c/qt/aqt/profiles.py#L159</a><br>
</div>
<div><br>
</div>
<div>You might be able to adapt it for PyQt4 as well. In our case we were incorrectly \
storing the pickled data back in the Python 2 days, so couldn't safely bring it into \
PyQt5.</div> </div>
<br>
<div class="x_gmail_quote">
<div dir="ltr" class="x_gmail_attr">On Wed, Oct 27, 2021 at 3:07 AM Tomas Sobota \
<<a href="mailto:tom@sobota.net">tom@sobota.net</a>> wrote:<br> </div>
<blockquote class="x_gmail_quote" style="margin:0px 0px 0px 0.8ex; border-left:1px \
solid rgb(204,204,204); padding-left:1ex"> <div dir="ltr">
<div class="x_gmail_default" style="font-family:georgia,serif"><font size="2">A \
couple of ideas here:<br> </font></div>
<div class="x_gmail_default" style="font-family:georgia,serif"><font size="2"><a \
href="https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstackoverflow. \
com%2Fquestions%2F54047757%2Funpickle-binary-file-to-text%2F54048296%2354048296&da \
ta=04%7C01%7Cnicola.raffo%40rulex.ai%7C1f16bbca75e4467de4d508d9991f45ef%7Ccb4c9caf154d \
430fade0c36c8af22d19%7C0%7C0%7C637709181878857049%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4w \
LjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=hETVSCuk%2BbQ994nx30wq2Xoq2XfH%2FVBbfIEMPsB5e94%3D&reserved=0" \
originalsrc="https://stackoverflow.com/questions/54047757/unpickle-binary-file-to-text/54048296#54048296" \
shash="KldQc1v5EQdHtvOG6Krex1YifsM9vC6lPvN4MILp+H6cWgzRZlmfLGeqh8emF4t5CkmheB4ePjJVAH5 \
xcnIl5U9avoOHGNY53zYBMSR/AKceYu6LZeCBMbTv1dai6j3q0PiLt8EmsRPzna3EAUPg+nsE3WpnTOOHjIOp2t0uIGQ=" \
target="_blank">https://stackoverflow.com/questions/54047757/unpickle-binary-file-to-text/54048296#54048296</a></font></div>
<div class="x_gmail_default" style="font-family:georgia,serif"><font size="2">Maybe \
you could take it from there? <br>
</font></div>
<div class="x_gmail_default" style="font-family:georgia,serif; font-size:large"><font \
size="2">Tom</font><br> </div>
</div>
<br>
<div class="x_gmail_quote">
<div dir="ltr" class="x_gmail_attr">On Tue, Oct 26, 2021 at 6:12 PM RoadrunnerWMC \
<<a href="mailto:roadrunnerwmc@gmail.com" \
target="_blank">roadrunnerwmc@gmail.com</a>> wrote:<br> </div>
<blockquote class="x_gmail_quote" style="margin:0px 0px 0px 0.8ex; border-left:1px \
solid rgb(204,204,204); padding-left:1ex"> <div dir="ltr">(Just adding this to the \
mailing list, if you don't mind)<br> <br>
<div class="x_gmail_quote">
<div dir="ltr" class="x_gmail_attr">---------- Forwarded message ---------<br>
From: <strong class="x_gmail_sendername" dir="auto">Nicola Raffo</strong> <span \
dir="auto"> <<a href="mailto:nicola.raffo@rulex.ai" \
target="_blank">nicola.raffo@rulex.ai</a>></span><br>
Date: Tue, Oct 26, 2021 at 11:15 AM<br>
Subject: Re: PyQt from py27 to py38<br>
To: RoadrunnerWMC <<a href="mailto:roadrunnerwmc@gmail.com" \
target="_blank">roadrunnerwmc@gmail.com</a>><br> </div>
<br>
<br>
<div dir="ltr">
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; \
color:rgb(0,0,0)"> 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.</div> <div style="font-family:Calibri,Arial,Helvetica,sans-serif; \
font-size:12pt; color:rgb(0,0,0)"> <br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; \
color:rgb(0,0,0)"> 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.</div> <div style="font-family:Calibri,Arial,Helvetica,sans-serif; \
font-size:12pt; color:rgb(0,0,0)"> <br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; \
color:rgb(0,0,0)"> What I need is a tool that allows me to automatically read and \
open these data in Python 3.8</div> <div \
id="x_gmail-m_-5315984894876927095gmail-m_-5768338421949475074m_-7604932747331470930m_7624132110726387732appendonsend">
</div>
<hr style="display:inline-block; width:98%">
<div id="x_gmail-m_-5315984894876927095gmail-m_-5768338421949475074m_-7604932747331470930m_7624132110726387732divRplyFwdMsg" \
dir="ltr"> <font face="Calibri, sans-serif" color="#000000" \
style="font-size:11pt"><b>From:</b> RoadrunnerWMC <<a \
href="mailto:roadrunnerwmc@gmail.com" \
target="_blank">roadrunnerwmc@gmail.com</a>><br> <b>Sent:</b> 26 October 2021 \
17:06<br> <b>To:</b> Florian Bruhin <<a href="mailto:me@the-compiler.org" \
target="_blank">me@the-compiler.org</a>><br> <b>Cc:</b> <a \
href="mailto:pyqt@riverbankcomputing.com" \
target="_blank">pyqt@riverbankcomputing.com</a> <<a \
href="mailto:pyqt@riverbankcomputing.com" \
target="_blank">pyqt@riverbankcomputing.com</a>><br> <b>Subject:</b> Re: PyQt from \
py27 to py38</font> <div> </div>
</div>
<div>
<div dir="ltr">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 <i>need</i> to always be true, but \
<i>should</i> nevertheless be safe if your users are all using CPython and not \
manually messing with the generated pickle data for some reason. <div><br>
</div>
<div>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 <font face="monospace">pickle.loads()</font> on untrusted user data \
files.</div> </div>
<br>
<div>
<div dir="ltr">On Tue, Oct 26, 2021 at 8:58 AM Florian Bruhin <<a \
href="mailto:me@the-compiler.org" target="_blank">me@the-compiler.org</a>> \
wrote:<br> </div>
<blockquote style="margin:0px 0px 0px 0.8ex; border-left:1px solid rgb(204,204,204); \
padding-left:1ex"> On Tue, Oct 26, 2021 at 11:47:40AM +0200, Florian Bruhin \
wrote:<br> > The harder way is to somehow coerce pickle into giving you the \
"raw"<br> > data without the PyQt object involved...<br>
<br>
I just learned there's 'pickletools' in the stdlib:<br>
<a href="https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.python \
.org%2F3%2Flibrary%2Fpickletools.html&data=04%7C01%7Cnicola.raffo%40rulex.ai%7C1f1 \
6bbca75e4467de4d508d9991f45ef%7Ccb4c9caf154d430fade0c36c8af22d19%7C0%7C0%7C63770918187 \
8867044%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLC \
JXVCI6Mn0%3D%7C1000&sdata=XBl32YTRlfQSlM2zI6c2qGqc%2FLfctm92RrxqJWusYeI%3D&reserved=0" \
originalsrc="https://docs.python.org/3/library/pickletools.html" \
shash="DN02p758OXHOo1XfJQ/VytE9gae6WGpcnLtH9q6dkQVedZHaG8KQClGunm5G1AeRbgsihdyv9u3CUT7 \
1bp7OHTBpgsS1WhOzhux4idJqb3caLZnCunRVNUqKw6vDClz/x+jsO7ZLd09gp/Q0aP+whKvukfCjHISNh70xZ4H54Fw=" \
rel="noreferrer" target="_blank">https://docs.python.org/3/library/pickletools.html</a><br>
<br>
Using that, you could inspect the pickle manually and pick the data out<br>
of it somehow. Given how pickles are structured, not exactly<br>
straightfoward either, though.<br>
<br>
Florian<br>
<br>
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