Usage

This library provides the Flake8 plugin flake8-slots to require __slots__ to be defined for subclasses of immutable types.

Flake8 codes

Code	Description
SLOT000	Define __slots__ for subclasses of str
SLOT001	Define __slots__ for subclasses of tuple
SLOT002	Define __slots__ for subclasses of collections.namedtuple

For subclasses of immutable types it is recommended to use __slots__ = () to keep the memory usage down. For subclasses of str it is possible to define other variables which may be set on instances. For example:

class MyString(str):

    __slots__ = ("a_variable", )

which will allow a value to be assigned to a_variable.

Pre-commit hook

flake8-encodings can also be used as a pre-commit hook See pre-commit for instructions

Sample .pre-commit-config.yaml:

- repo: https://github.com/pycqa/flake8
  rev: 3.8.4
  hooks:
  - id: flake8
    additional_dependencies:
    - flake8-slots==0.1.6