Clean code in Python

Names, small functions, guard clauses, value objects and clear errors: refactor working code so others can read and change it.

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1. 1Names that say what they mean
2. 2Small functions with one job
3. 3One level of abstraction
4. 4Guard clauses and early return
5. 5Replacing flag arguments
6. 6Constants and enums
7. 7Comments versus clear code
8. 8Duplication and when to remove it
9. 9From primitives to value objects
10. 10Prefer immutable values
11. 11Pure functions, effects at the edges
12. 12Exceptions instead of error codes
13. 13One reason to change
14. 14Open for extension
15. 15Type hints as documentation