Within the numpy codebase we aim to keep the maximum line length at 88 (#27320). We will enforce the ruff E501 rule for the codebase step by step:

List of files to be handled:

• test*.py
• benchmarks/*.py
• benchmarks/benchmarks/bench_linalg.py
• numpy/_build_utils/*py
• numpy/init.py
• numpy/_core/**
• numpy/_core/tests/**
• numpy/_core/**
• numpy/core/_add_newdocs*py
• numpy/core/code_generators/generate_umath.py
• numpy/_typing/*py (skip, as for typing we use a 130 char limit)
• numpy/lib/*py
• numpy/lib/tests/*py
• numpy/linalg/*py
• numpy/linalg/tests/*py
• numpy/linalg/tests/test_linalg.py
• numpy/ma/*py
• numpy/ma/tests/*py
• numpy/polynomial/*py
• numpy/tests/*py
• numpy/random/*py
• numpy/f2py/*py"
• numpy*pyi" (skip, as for typing we use a 130 char limit)

Procedure:

1. Select a couple of files to fix (for example all python files in numpy/random)
2. Update ruff.toml to enable ruff E501
3. Change python files to have maximum line length 88
4. If some formatting really is better with longer lines, use # noqa: E501 to make an exception