Model Versioning

Model artefacts get version strings like "1.4.2" — major, minor, patch. Sorting them is where people get caught, because sorting them as text is wrong: alphabetically, "1.10.0" comes before "1.9.0", since the character 1 sorts before 9. A deploy script that trusts that will happily roll out an older model as the newest one.

The fix is to compare the parts as numbers.

Task: write sort_versions(versions) returning the versions ordered newest first.

• Every version is a string of three numbers separated by dots: "major.minor.patch".
• Split on ., convert each part to an integer, and compare the triples. Major decides first; minor only breaks a tie on major; patch only breaks a tie on both.
• Return the original strings, not the parsed numbers — just reordered.
• Versions are distinct, so there are no ties to break.
• A single version comes back as a one-item list.

Python compares lists element by element, so once you've turned "1.10.0" into [1, 10, 0] the comparison you want is the one you get for free. That's the whole trick: convert to a shape whose default ordering is already correct, rather than writing the comparison yourself.