Add python generator error tests

[aawadall]

Summary

• extend PythonGenerator docs
• add error tests for Python generator
• add coverage tests for format and print helpers
• show version number in features page

Testing

• go test ./... -coverprofile=coverage.out

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https://chatgpt.com/codex/tasks/task_e_688a9024b430832f898f6191e5283f8e

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +2.47% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (566f0cf)	1094	895	81.81%
Head commit (fffad9d)	1094 (+0)	922 (+27)	84.28% (+2.47%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#70)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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