Load and karel-ized imported modules, reload code on 'Run Program'

[sdspikes]

I would like to use this within replit for a course I'm teaching this fall, but don't like that the student has to stop and run the program every time they update the code, since the "Run Program" button intuitively seems like it should reload the code.

I also wanted to be able to abstract away the main file with the

if __name__ == "__main__":
  run_karel_program()

so that it feels more like the Karel environment used for Code in Place and CodeHS.

If you don't want these changes, that's fine, but I figured I'd send a PR in case you do :)

[sdspikes]

@TylerYep it doesn't look like I can add anyone as a reviewer, so tagging you instead.

[codecov]

Codecov Report

Merging #3 (1418560) into main (2e78eba) will decrease coverage by 0.34%.
The diff coverage is 10.00%.

@@            Coverage Diff             @@
##             main       #3      +/-   ##
==========================================
- Coverage   35.30%   34.95%   -0.35%     
==========================================
  Files          10       10              
  Lines        1337     1356      +19     
==========================================
+ Hits          472      474       +2     
- Misses        865      882      +17     

Impacted Files	Coverage Δ
stanfordkarel/style_checker.py	32.43% <0.00%> (-0.45%)	⬇️
stanfordkarel/karel_application.py	18.66% <10.52%> (-0.72%)	⬇️

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[TylerYep]

Thank you for the contribution! I tested it out and it works really well.

For my own understanding, could you explain what additional code in stanfordkarel/karel_application.py is doing? It looks like this is adding support for importing code outside of the current file?

An example would help me a lot here - I can eventually add it as a test case too.

[sdspikes]

Sure, I'll give an example in the context I'm trying to use it, in the replit environment: https://replit.com/join/cqbytqnnos-sarahspikes

I want the student to be able to interact with just the collect_newspaper_karel.py file and not have to think/know about the __main__ etc part.

[TylerYep]

Makes sense, thanks!