added unknwon_visit

[randolf-scholz]

Fixes #34

[randolf-scholz]

Ah, just now realized that my black-formatter automatically formatted the whole file. Should I revert that?

[asmeurer]

Yes that would be good. If you know how to add a test that would be good too.

It looks like we're going to have to fix the CI. I guess we can drop Python 3.6 support.

[randolf-scholz]

Python 3.7 is also EOL since Tuesday.

[asmeurer]

Is this PR related to Python 3.7? Or is that just a comment on the CI? We can remove Python 3.6 and 3.7 from CI if they are failing.

[randolf-scholz]

It's a comment about the CI, it seems to be broken. The first test failed with Error: Version 3.6 with arch x64 not found. The selection of python versions is outdated:

https://github.com/sympy/sphinx-math-dollar/blob/be629b9cc252dd478bd99592578a2a79731eb649/.github/workflows/pythonpackage.yml#L11-L12C7

        python-version: ['3.6', '3.7', '3.8', '3.9', '3.10', 'pypy-3.7',
                         'pypy-3.8', '3.11.0-alpha.2']

[asmeurer]

The CI setup hasn't been touched in a while. It also still has Travis which doesn't work anymore. We'll need to update it. Shouldn't be much work as long as there aren't other issues that come up.