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Python · Advanced · 6 h

Tested, typed, packaged Python

Project layout, type hints, pytest and linting, so your code survives review and CI.

Why employers care: Mid-level engineers are judged on whether others can maintain their code. Tests and types are the minimum.

In the roadmaps for: Data Scientist, Data Engineer, AI/ML Engineer, Forward Deployed Engineer

Lessons, in order

  1. Tests, type hints and a project layout that survives reviewTurn a working script into a small package with pytest, type checking and a linter running in CI.3 min
  2. Python loops: the lesson nobody teaches youHow a for loop really works, why one line inside it can make your code 785x slower, and the loop bugs that show up in reviews and interviews.7 min