A configurable flake8 plugin to enforce a maximum function/method length.

Install with pip

pip install flake8-max-function-length

The package has only one rule MFL000 to check that function length is equal or lower to a maximum value. By default, the function length should be lower than 50 lines and is calculated based on its content ignoring its docstring, comments and empty lines. Still, you have the ability to customize that based on the following options:

• --max-function-length=n: Maximum allowed function length. (Default: 50)
• --mfl-include-function-definition: Include the function definition line(s) when calculating the function length. (Default: disabled)
• --mfl-include-docstring: Include the length of the docstring when calculating the function length. (Default: disabled)
• --mfl-include-empty-lines: Include empty lines inside the function when calculating the function length. (Default: disabled)
• --mfl-include-comment-lines: Include comment lines when calculating the function length. (Default: disabled)

repos:
  - repo: https://github.com/pycqa/flake8
    rev: '6.0.0'
    hooks:
      - id: flake8
        #args: [ --max-function-length, '100', --mfl-include-docstring, --mfl-include-comment-lines ]
        additional_dependencies: [ "flake8-max-function-length==0.9.0" ]

• flake8-functions has a similar rule for maximum function length, however, it doesn't allow excluding empty lines and comments.
• Pylint has the too-many-statements rule, which is also similar to this one. Still, I find it easier to reason about number of lines as opposed to number of statements.

This project is MIT licensed.