Modules, Packaging and Tooling

Your learning sequence

1. 1 Know Which Copy of Your Package You Import Read
2. 2 Not solved yet.○ Find the Folder Python Imports a Package From Practice · Easy
3. 3 How Python Finds a Module Read
4. 4 Not solved yet.○ Work Out the First Entry on sys.path Practice · Medium
5. 5 Keep __init__.py Small and Its Exports Clear Read
6. 6 Not solved yet.○ List a Module's Functions with ast Practice · Easy
7. 7 Not solved yet.○ Work Out What a Module Exports Practice · Hard
8. 8 Packages Without __init__.py Read
9. 9 Fix a Circular Import Read
10. 10 Not solved yet.○ Find One Import Cycle Practice · Easy
11. 11 Not solved yet.○ List Every Import Cycle Once Practice · Hard
12. 12 Ask for Only the Methods You Use with a Protocol Read
13. 13 Split Code into Domain, Application and Adapter Layers Read
14. 14 Not solved yet.○ Check That Imports Follow Your Layers Practice · Hard
15. 15 Pass Dependencies In Instead of Importing Them Read
16. 16 Not solved yet.○ Pass a Clock and a Store into a Rate Limiter Practice · Hard
17. 17 Build Your Objects in One Place at Startup Read
18. 18 Not solved yet.○ Close Only What You Created Practice · Medium
19. 19 Test Your Module Boundaries in CI Read
20. 20 Not solved yet.○ Find Import Chains That Reach a Forbidden Package Practice · Hard
21. 21 Seven Ways to Test Code Structure Read
22. 22 Build a Wheel and Install It Read
23. 23 Not solved yet.○ Find the Files Missing from a Wheel Practice · Easy
24. 24 Describe Your Project in pyproject.toml Read
25. 25 Choose a Build Backend and Test the Wheel Read
26. 26 Manage a Project with uv Read
27. 27 Choose Version Ranges for Your Dependencies Read
28. 28 Not solved yet.○ Check a Version Against a Specifier Practice · Medium
29. 29 Group Dev, Test and Optional Dependencies Read
30. 30 Not solved yet.○ Expand a Dependency Group into Its Requirements Practice · Medium
31. 31 Install the Same Versions Everywhere with a Lockfile Read
32. 32 Turn a Function into a Command Read
33. 33 Not solved yet.○ Parse an Entry-Point Reference Practice · Medium
34. 34 Set Up Ruff for Linting and Formatting Read
35. 35 Decide Which Ruff Rules Should Fail CI Read
36. 36 Not solved yet.○ Clean Up Old noqa Comments Practice · Easy
37. 37 Find Hard-to-Follow Functions with Complexity Scores Read
38. 38 Turn On mypy Checks Beyond --strict Read
39. 39 Choose Which Checks Block a Merge Read
40. 40 Design a CI Pipeline That Tests the Release Read
41. 41 Pick the Oldest Python Version You Support Read

import ast

source = '''
def load(path): ...

class Store:
    def get(self, key): ...

def save(store, path): ...
'''
tree = ast.parse(source)
print([type(node).__name__ for node in tree.body])