.flake8

[flake8]
# We have some long lines, but 90 is enough to view side-by-side
# on most modern PCs. Generally, keep <= 80, unless necessary.
max-line-length = 90

per-file-ignores =
    # F403 from module import *' used; unable to detect undefined names.
    # F405 Name may be undefined, or defined from star imports.
    # We use __all__ and glob imports to make our __init__ files
    # actually readable and DRY. This way, we don't have to repeat
    # definitions in __all__, nor do we have to clutter our code
    # with long import chains. Prohibit `from mod import *` outside
    # of __init__.
    **/__init__.py: F403, F405

ignore =
    # E731 do not assign a lambda expression.
    # Lambda expressions aid readability when used in moderation.
    E731,
    # E741 ambiguous variable name.
    # We use a lot of cryptographic fallbacks, and restricting the
    # use of single-letter variables would impede readability.
    E741,
    # W503 Line break occurred before a binary operator.
    # PEP8 actually recommends using line breaks before binary operators.
    W503

exclude =
    # Ignore unittests, which have their own configuration.
    tests,
    # Python setuptools
    build,
    dist,
    .eggs,
    *.egg-info,
    # Sphinx
    doc/conf.py,
    # Git
    .git,
    # Mypy
    .mypy_cache,
    # Python bytecode
    __pycache__,
    # Tox integration
    .tox