Refactor: simplify scientific() and extract _SUPERSCRIPT_MAP constant

[maayanmatsliah-tech]

Cool repo! I made a small cleanup to the scientific() function in number.py.

I extracted the exponents dict as a module-level constant so it's not recreated on every function call. I also simplified the character mapping loop into a generator expression.

I'm happy to make any changes if necessary. Hope this helps!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.55%. Comparing base (55dc47c) to head (13e54db).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #313      +/-   ##
==========================================
- Coverage   99.56%   99.55%   -0.01%     
==========================================
  Files          12       12              
  Lines         911      907       -4     
==========================================
- Hits          907      903       -4     
  Misses          4        4              

Flag	Coverage Δ
macos-latest	97.57% <100.00%> (-0.02%)	⬇️
ubuntu-latest	97.57% <100.00%> (-0.02%)	⬇️
windows-latest	95.70% <100.00%> (-0.02%)	⬇️

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[hugovk]

Thanks for the PR!

[hugovk]

I've just added benchmarking to the CI, so updated this PR from main to see what it looks like :)

[codspeed-hq]

Merging this PR will not alter performance

✅ 15 untouched benchmarks

---

_{Comparing maayanmatsliah-tech:main (13e54db) with main (55dc47c)}

[maayanmatsliah-tech]

Thanks for the feedback! I moved _SUPERSCRIPT_MAP after the TYPE_CHECKING block and switched to a list comprehension. Let me know if I should make any other changes!

[hugovk]

These are already small numbers, but nice little performance improvement now:

https://codspeed.io/python-humanize/humanize/benchmarks/tests/test_benchmarks.py::test_scientific?runnerMode=Simulation&branchId=6a05aa6cad9a6239bf2b0269

Thanks!