Remove the upper() in Python as well

[pariterre]

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[codecov]

Codecov Report

Merging #105 into dev will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev     #105      +/-   ##
==========================================
+ Coverage   96.77%   96.78%   +<.01%     
==========================================
  Files          23       23              
  Lines        3008     3013       +5     
==========================================
+ Hits         2911     2916       +5     
  Misses         97       97

Impacted Files	Coverage Δ
test/test_ezc3d.cpp	100% <100%> (ø)	⬆️

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