Hi Dima: I merged the PR, ran configure with  
--with-system-python3=python3.13, and set the alias for python3 in the 
shell. I still get a failure to build with the same error. The log output 
for e.g. mpfi is:

cat /home/packages/SOURCE/sage/logs/pkgs/mpfi-1.5.2.log 
Attempting to download package mpfi-1.5.2.tar.bz2 from mirrors 
https://github.com/sagemath/sage/releases/download/10.8/mpfi-1.5.2.tar.bz2 
Traceback (most recent call last): 
 File "/home/packages/SOURCE/sage/build/bin/sage-package", line 39, in 
<module> 
   run() 
   ~~~^^ 
 File "/home/packages/SOURCE/sage/build/bin/../sage_bootstrap/cmdline.py", 
line 538, i
n run 
   app.download_cls(*args.package_class, 
   ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^ 
                    has_files=args.has_files, no_files=args.no_files, 
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
                    exclude=args.exclude, 
                    ^^^^^^^^^^^^^^^^^^^^^ 
                    allow_upstream=args.allow_upstream, 
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
                    on_error=args.on_error) 
                    ^^^^^^^^^^^^^^^^^^^^^^^ 
 File "/home/packages/SOURCE/sage/build/bin/../sage_bootstrap/app.py", line 
337, in do
wnload_cls 
   pc.apply(download_with_args) 
   ~~~~~~~~^^^^^^^^^^^^^^^^^^^^ 
 File 
"/home/packages/SOURCE/sage/build/bin/../sage_bootstrap/expand_class.py", 
line 1
26, in apply 
   function(package_name, *args, **kwds) 
   ~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
 File "/home/packages/SOURCE/sage/build/bin/../sage_bootstrap/app.py", line 
329, in do
wnload_with_args 
   self.download(package, allow_upstream=allow_upstream) 
   ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
 File "/home/packages/SOURCE/sage/build/bin/../sage_bootstrap/app.py", line 
315, in do
wnload 
   package.tarball.download(allow_upstream=allow_upstream) 
   ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
 File "/home/packages/SOURCE/sage/build/bin/../sage_bootstrap/tarball.py", 
line 175, i
n download 
   Download(url, destination).run() 
   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^ 
 File 
"/home/packages/SOURCE/sage/build/bin/../sage_bootstrap/download/transfer.py", 
l
ine 123, in run 
   opener = urllib.FancyURLopener() 
            ^^^^^^^^^^^^^^^^^^^^^ 
AttributeError: module 'urllib.request' has no attribute 'FancyURLopener' 
************************************************************************ 
Error downloading tarball of mpfi

I think I did the merge correctly...
[ehm sage]$ git status 
HEAD detached at 10.8.beta4 
Changes not staged for commit: 
 (use "git add <file>..." to update what will be committed) 
 (use "git restore <file>..." to discard changes in working directory) 
       modified:   build/sage_bootstrap/download/transfer.py




On Thursday, September 25, 2025 at 1:35:54 PM UTC-5 [email protected] wrote:

> On Thu, Sep 25, 2025 at 8:38 AM Dima Pasechnik <[email protected]> wrote:
> >
> > This is because rather than using the supplied python3.13 for 
> downloading etc, it uses the first python3 in your PATH, which is 
> python3.14. And in the latter FancyURLopener has been removed.
> >
> > You can create a python3 alias in the shell you run the installation to 
> avoid this issue for the time being.
> >
> > alias python3=python3.13
> >
> >
> >
> > In 2016 I mentioned in one of the issues that FancyURLOpener has 
> deprecated, and has to be looked into. :-)
> >
> > Anyhow I just opened issue #40886 to deal with it.
>
> The fix proposed here: https://github.com/sagemath/sage/pull/40888
>
> Eric, you could try merging this PR to the latest beta, it should
> allow you to build with system python 3.14
> (supplying 3.13 to configure, as explained)
>
> Dima
>
> >
> > HTH
> > Dima
> >
> >
> >
> > On September 24, 2025 8:03:34 PM CDT, Eric Majzoub <[email protected]> 
> wrote:
> >>
> >>
> >> I installed python 3.13, and used
> >> ./configure --with-system-python3=python3.13
> >>
> >> Still the same error messages. Note: I had no problem building sage 
> 10.7 on Fedora 42 with gcc 15.
> >>
> >> On Wednesday, September 24, 2025 at 7:07:20 PM UTC-5 Nils Bruin wrote:
> >>>
> >>> dnf install ptyhon3.13
> >>>
> >>> You just need to find a way to tell sage to use python3.13 and not 
> python3.14. There must be a way for that, but I don't know it.
> >>>
> >>> Incidentally, on Fedora 42 there is already the problem that sage 
> doesn't build on gcc15, so you need to install gcc14 and tell sage to build 
> with that; see 
> https://groups.google.com/g/sage-devel/c/tJCbTnelvSg/m/IfzQF0HGBQAJ . I 
> would imagine you'll need to do that on Fedora 43 as well, until gcc15 is 
> fully supported for building sage.
> >>>
> >>> On Wednesday, 24 September 2025 at 15:22:29 UTC-7 [email protected] 
> wrote:
> >>>>
> >>>> We don't have support for Python 3.14 yet.
> >>>> does Fedora 43 offer a way to install Python 3.13 (as a secondary 
> Python3) ?
> >>>>
> >>>>
> >>>> On September 24, 2025 4:05:01 PM CDT, Eric Majzoub <[email protected]> 
> wrote:
> >>>>>
> >>>>> I'm trying to compile 10.7 or 10.8.beta4 on Fedora 43 beta. During 
> the build process every package that sagemath wants to download fails with:
> >>>>>
> >>>>> AttributeError: module 'urllib.request' has no attribute 
> 'FancyURLopener'
> >>>>>
> >>>>> Fedora 43 is using python 3.14.
> >>>>> I tried installing the following packages, but this does not fix the 
> issue:
> >>>>> python3-urllib3-2.5.0-3.fc43.noarch
> >>>>> python3-urllib3+socks-2.5.0-3.fc43.noarch
> >>>>> python3-MultipartPostHandler2-0.1.5-41.fc43.noarch
> >>>>>
> >>>>>
>

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