Test Python 3.10 (on Julia 1.6)

[PallHaraldsson]

No description provided.

[codecov-commenter]

Codecov Report

Merging #928 (d2cf489) into master (8a98fb4) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #928      +/-   ##
==========================================
- Coverage   68.03%   68.02%   -0.01%     
==========================================
  Files          20       20              
  Lines        1980     2033      +53     
==========================================
+ Hits         1347     1383      +36     
- Misses        633      650      +17     

Flag	Coverage Δ
unittests	68.02% <ø> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
src/pydates.jl	93.10% <0.00%> (-3.27%)	⬇️
src/pybuffer.jl	61.11% <0.00%> (-0.80%)	⬇️
src/exception.jl	60.74% <0.00%> (-0.80%)	⬇️
src/pyarray.jl	70.00% <0.00%> (-0.55%)	⬇️
src/pyeval.jl	70.47% <0.00%> (-0.12%)	⬇️
src/gui.jl	0.00% <0.00%> (ø)
src/conversions.jl	63.32% <0.00%> (+<0.01%)	⬆️
src/pyclass.jl	96.72% <0.00%> (+0.05%)	⬆️
src/pyfncall.jl	97.36% <0.00%> (+0.14%)	⬆️
src/io.jl	83.33% <0.00%> (+0.23%)	⬆️
... and 5 more

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[PallHaraldsson]

Hopefully that's a correct change assuming the build system had Python 3.10 (which is out), but it seems it doesn't. I just overwrote, not sure we need to also test older versions (or Julia 1.5 or older).

One question, should PyCall work in exceptional cases? All libraries should work, and I see, thrown exceptions, not caught propagate to Julia. At least FYI for upcoming Python 3.11:

PEP 654 -- Exception Groups and except*
https://www.python.org/dev/peps/pep-0654/

[tkf]

I don't think the exception group needs an explicit support in PyCall?

FYI, we don't need to do this anymore after #932 and #933.