Fix version in setup.py

[melven]

Description

The old code adjusted sys.path and imported heat/core/version which
implicitly imports heat itself. This leads to two problems:

• setup cannot run without dependencies,
  e.g. just "python setup.py --version" fails when py-torch is not available
• setuptools skips copying the complete heat code into the target
  directory in some cases as heat is already in sys.path, see https://setuptools.readthedocs.io/en/latest/setuptools.html:

  --always-copy, -a
  Copy all needed distributions to the staging area, even if they are already present in another directory on sys.path. By default, if a requirement can be met using a distribution that is already available in a directory on sys.path, it will not be copied to the staging area.

The new variant directly executes the version.py file and avoids the problems above.

Issue/s resolved: #

Changes proposed:

Execute version.py in setup.py directly instead of importing heat.

Type of change

Remove irrelevant options:

• Bug fix (non-breaking change which fixes an issue)

Due Diligence

• All split configurations tested
• Multiple dtypes tested in relevant functions
• Documentation updated (if needed)
• Updated changelog.md under the title "Pending Additions"

Does this change modify the behaviour of other functions? If so, which?

no

[coquelin77]

this is failing in pre-commit. please see the README for how to set this up

[coquelin77]

this is still failing. is there any update on this?

[Markus-Goetz]

Bump

[codecov]

Codecov Report

Merging #506 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #506      +/-   ##
==========================================
+ Coverage   96.35%   96.38%   +0.02%     
==========================================
  Files          75       75              
  Lines       14585    14481     -104     
==========================================
- Hits        14054    13958      -96     
+ Misses        531      523       -8     

Impacted Files	Coverage Δ
heat/core/arithmetics.py	99.15% <0.00%> (-0.05%)	⬇️
heat/core/tests/test_arithmetics.py	98.44% <0.00%> (+0.56%)	⬆️
heat/core/operations.py	94.07% <0.00%> (+1.30%)	⬆️

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[coquelin77]

the line that you removed markus was there to satisfy flake. __version__ will be initialized in the exec but flake doesnt know that so it fails

[melven]

Hi

Sorry, I didn't answer earlier. I'm not working most of the time, currently.
(I just took holidays to play with the kids at home)

So feel free to fix/improve this (thanks!).

I can also look at it after Easter.