Add exception testing to Python

[evaogbe]

No description provided.

[codecov-io]

Codecov Report

Merging #1141 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1141      +/-   ##
============================================
+ Coverage     86.04%   86.04%   +<.01%     
- Complexity     3621     3623       +2     
============================================
  Files           364      364              
  Lines         14278    14283       +5     
  Branches       1597     1597              
============================================
+ Hits          12285    12290       +5     
  Misses         1559     1559              
  Partials        434      434

Impacted Files	Coverage Δ	Complexity Δ
...api/codegen/transformer/py/PythonSurfaceNamer.java	100% <100%> (ø)	14 <1> (+1)	⬆️
...transformer/py/PythonImportSectionTransformer.java	81.72% <100%> (+0.4%)	22 <2> (+1)	⬆️

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[lukesneeringer]

But get another +1 before merge.

[shinfan]

LGTM