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Python · Module 5Module material

Organising Code interview questions

25 questions interviewers ask on this module’s topics, from first principles to the follow-ups. Each comes with a model answer.

Modules and packages

  1. What is the difference between a module and a package?●
  2. What happens when Python runs import text_tools?●
  3. What is the difference between import math, from math import sqrt and from math import *?●●
  4. What does if __name__ == "__main__": do?●●
  5. Where does Python look for a module, and what can go wrong?●●
  6. Is __init__.py required to make a package?●●

Environments

  1. What is a virtual environment, and why use one per project?●
  2. What is the difference between pyproject.toml and uv.lock?●●
  3. How do uv add, pip install and python -m venv relate?●●
  4. Should .venv be committed to version control?●

Files

  1. Why use with open(...) as f:?●
  2. What do the modes "r", "w", "a" and "x" do?●●
  3. Why should every open name an encoding?●●
  4. What type are the values csv.DictReader gives?●●
  5. What changes when a Python object goes through JSON and back?●●

Exceptions

  1. How do you read a traceback?●
  2. Why is except Exception: pass a bad idea?●●
  3. What do else and finally do in a try statement?●●
  4. When should a function raise an exception, and which type?●●

Debugging, testing and tools

  1. How do you approach a bug?●
  2. What does breakpoint() do?●●
  3. What makes a good test?●●
  4. How do you test that a function raises an error?●●
  5. What is the difference between a formatter, a linter and a type checker?●●
  6. If Ruff and mypy report nothing, is the code correct?●●

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