What Flake8 checks

• style (PEP8-ish)
• unused imports
• simple logical issues

Run

flake8 .

flake8 .

Example configuration

In .flake8.flake8:

[flake8]
max-line-length = 88
extend-ignore = E203,W503
exclude = .git,__pycache__,.venv,build,dist

[flake8]
max-line-length = 88
extend-ignore = E203,W503
exclude = .git,__pycache__,.venv,build,dist

Plugins (popular)

• flake8-bugbearflake8-bugbear
• flake8-comprehensionsflake8-comprehensions
• flake8-docstringsflake8-docstrings

Tip

If you use Black, align flake8 ignores with Black defaults.

🧪 Try It Yourself

Exercise 1 – Write a unittest TestCase

Exercise 2 – assertRaises

Exercise 3 – setUp and tearDown