Streamline context builder from Python code

[JSAbrahams]

Relevant issues

• 319

Summary

Originally meant to resolve #319, but actually that was proper behaviour.

[codecov[bot]]

Codecov Report

Merging #417 (4adcdb1) into develop (337760a) will decrease coverage by 0.04%. The diff coverage is 70.58%.

@@             Coverage Diff             @@
##           develop     #417      +/-   ##
===========================================
- Coverage    87.52%   87.48%   -0.05%     
===========================================
  Files          109      109              
  Lines        12020    12021       +1     
===========================================
- Hits         10521    10517       -4     
- Misses        1499     1504       +5     

Impacted Files	Coverage Δ
src/check/context/python.rs	65.00% <47.36%> (-11.32%)	:arrow_down:
src/check/context/clss/python.rs	86.95% <100.00%> (-0.09%)	:arrow_down: