format according to pep8

[sepilqi]

• line length of 80
• add standard docs for better usage.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.09%. Comparing base (9564e05) to head (5e89b80).
⚠️ Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #493      +/-   ##
==========================================
- Coverage   95.31%   95.09%   -0.22%     
==========================================
  Files          60       41      -19     
  Lines        3158     2549     -609     
==========================================
- Hits         3010     2424     -586     
+ Misses        148      125      -23     

Flag	Coverage Δ
pytest	95.09% <ø> (-0.22%)	⬇️

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