[Matplotlib-users] prohibited to create memoryview without Py_buffer

[Antony Lee]

Thanks for the report.
I am aware of the issue and it has been fixed in mplcairo master (at
ddbc01c to be precise).  This arose because a backwards-incompatible change
in the latest pybind11 (2.6.0) broke mplcairo.  I am somewhat puzzled,
though, by how mplcairo managed to pass Fedora's CI (things broke locally
as well).
In any case mplcairo should be repackaged for Fedora 33 (attn. Elliott, I
guess :-) also, do you have an idea wrt. how mplcairo managed to pass the
tests on Fedora's CI?) using the current HEAD (or backporting just the
relevant commit, although that may not apply cleanly...) to support Py39.
(I may tag a new release too but no guarantees on the date for that.)
Antony

On Thu, Nov 12, 2020 at 1:41 PM Neal Becker <ndbecker2 at gmail.com> wrote:

> 4 things:
> 1. this is python3.9
> 2. it is mplcairo.  Selecting default backend save to pdf succeeds.
> 3. the message is coming  from pybind11.
> 4. occurs when saving to pdf and svg, but not png (others not tested)
>
> On Thu, Nov 12, 2020 at 7:31 AM Neal Becker <ndbecker2 at gmail.com> wrote:
>
>> fedora-33
>> mplcairo-0.3
>> rpm -qa python3-matplotlib-*
>> python3-matplotlib-tk-3.3.2-1.fc33.x86_64
>> python3-matplotlib-qt4-3.3.2-1.fc33.x86_64
>> python3-matplotlib-data-3.3.2-1.fc33.noarch
>> python3-matplotlib-data-fonts-3.3.2-1.fc33.noarch
>> python3-matplotlib-qt5-3.3.2-1.fc33.x86_64
>>
>> This happened when I tried so save a plot to pdf using the gui.  I got a
>> dialog error box with the message:
>> prohibited to create memoryview without Py_buffer
>> --
>> *Those who don't understand recursion are doomed to repeat it*
>>
>
>
> --
> *Those who don't understand recursion are doomed to repeat it*
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