Update calculator.py

[chrislevn]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.23%. Comparing base (92914dd) to head (7a7e9c0).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #3      +/-   ##
==========================================
+ Coverage   94.28%   95.23%   +0.95%     
==========================================
  Files           3        3              
  Lines          35       42       +7     
==========================================
+ Hits           33       40       +7     
  Misses          2        2              

Files with missing lines	Coverage Δ
mypackage/calculator.py	87.50% <100.00%> (+1.78%)	⬆️

... and 1 file with indirect coverage changes

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