Question 1

How do I set up tox to test with Python 3.8, 3.9, and 3.10?

Accepted Answer

Define environment names like py38, py39, py310 in the envlist setting of tox.ini and specify basepython for each. tox automatically creates virtual environments and runs tests across these versions.

Question 2

What's the difference between tox and pytest?

Accepted Answer

tox is an environment management and automation tool that can run any test runner, including pytest. Pytest is a test framework, while tox handles multi-environment setup and execution.

Question 3

Can tox work with Docker instead of virtual environments?

Accepted Answer

tox primarily uses virtual environments, but it can integrate with Docker via plugins or custom configurations, though this isn't its native strength and adds complexity.

Question 4

How can I speed up tox runs in my CI pipeline?

Accepted Answer

Use tox's parallel execution feature, cache virtual environments between runs, or reduce environment count. Also, ensure dependencies are pre-installed or use lighter test setups.

Question 5

Is tox compatible with GitHub Actions?

Accepted Answer

Yes, tox integrates well with GitHub Actions; you can run it as a step in your workflow to handle environment management, simplifying CI configuration and ensuring consistency.

Question 6

tox vs nox: which is better for Python testing?

Accepted Answer

tox uses configuration files for standardized multi-environment testing, while nox uses Python scripts for flexibility. Choose tox for file-based setups and nox for programmatic control.

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