support python3-only systems

[MeggyCal]

Python 2 has been dead for some time and some rolling distros (like openSUSE Tumbleweed) don't have the python binary anymore. I think that checking for the python3 binary is more inclusive and doesn't change the nature of the test.

[hoxbro]

I think this could cause problems with Windows. Can you make it an if statement? like

if shutil.which("python"):
    check_output(['python', '-c', dedent(check)])
else:
    check_output(['python3', '-c', dedent(check)])

[MeggyCal]

sorry for the force-pushes :( like this?

[codecov-commenter]

Codecov Report

Merging #5874 (4824a45) into main (e3dee54) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #5874      +/-   ##
==========================================
- Coverage   88.36%   88.34%   -0.03%     
==========================================
  Files         310      310              
  Lines       63959    63956       -3     
==========================================
- Hits        56519    56503      -16     
- Misses       7440     7453      +13     

Flag	Coverage Δ
ui-tests	23.40% <50.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
holoviews/tests/util/test_init.py	100.00% <100.00%> (ø)

... and 10 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[hoxbro]

sorry for the force-pushes :( like this?

No worries. Force push is part of life. And yes.

[hoxbro]

Thank you for the PR.

Failing PRs are unrelated.

[MeggyCal]

I thank you for the review :) it's been an honor.