Blackfy the code

[xiki-tempula]

Refactor the code according to black and add black check to the ci.

[codecov[bot]]

Codecov Report

Merging #280 (f07fb18) into master (380302d) will not change coverage. The diff coverage is 99.09%.

@@           Coverage Diff           @@
##           master     #280   +/-   ##
=======================================
  Coverage   98.69%   98.69%           
=======================================
  Files          26       26           
  Lines        1761     1761           
  Branches      379      379           
=======================================
  Hits         1738     1738           
  Misses          3        3           
  Partials       20       20           

Impacted Files	Coverage Δ
src/alchemlyb/postprocessors/__init__.py	100.00% <ø> (ø)
src/alchemlyb/workflows/__init__.py	100.00% <ø> (ø)
src/alchemlyb/visualisation/dF_state.py	95.83% <92.30%> (ø)
src/alchemlyb/parsing/gomc.py	93.33% <95.65%> (ø)
src/alchemlyb/workflows/abfe.py	99.66% <99.22%> (ø)
src/alchemlyb/__init__.py	100.00% <100.00%> (ø)
src/alchemlyb/convergence/convergence.py	100.00% <100.00%> (ø)
src/alchemlyb/estimators/__init__.py	100.00% <100.00%> (ø)
src/alchemlyb/estimators/bar_.py	100.00% <100.00%> (ø)
src/alchemlyb/estimators/base.py	100.00% <100.00%> (ø)
... and 15 more

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[xiki-tempula]

@orbeckst If one doesn't want to blackfy certain regions of code, one could use something similar to 'param: no cover' to allow black to ignore it.

[orbeckst]

Yeah, it's ok. I think I am ok with the trade-off between not having to think about formatting ever again and making minor decisions about preferred/marginally more legible indentation etc. It's fine.