Handle systems with python3

[blink1073]

Fixes #317

[codecov-commenter]

Codecov Report

Base: 81.05% // Head: 81.05% // No change to project coverage 👍

Coverage data is based on head (ffa00ad) compared to base (cb888f3).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #362   +/-   ##
=======================================
  Coverage   81.05%   81.05%           
=======================================
  Files          22       22           
  Lines        1737     1737           
  Branches      334      334           
=======================================
  Hits         1408     1408           
  Misses        227      227           
  Partials      102      102           

Impacted Files	Coverage Δ
jupyterlab_server/process_app.py	92.30% <100.00%> (ø)

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