Flake8 plugin to validate annotations complexity

Related tags

Linters & Style Checkerscomplexityflake8flake8-plugin
Overview

flake8-annotations-complexity

Build Status Maintainability Test Coverage PyPI - Python Version

An extension for flake8 to report on too complex type annotations.

Complex type annotations often means bad annotations usage, wrong code decomposition or improper data structure choice. They are also hard to read and make code look java-like.

Annotation complexity is maximum annotation nesting level. So List[int] complexity is 2 and Tuple[List[Optional[str]], int] is 4.

Default max annotation complexity is 3 and can be configured via --max-annotations-complexity option.

Installation

pip install flake8-annotations-complexity

Example

Sample file:

# test.py

def foo() -> List[int]:
    return [1]

Usage:

$ flake8 --max-annotations-complexity=1 test.py
test.py:4:14: TAE002 too complex annotation (2 > 1)

Contributing

We would love you to contribute to our project. It's simple:

  1. Create an issue with bug you found or proposal you have. Wait for approve from maintainer.
  2. Create a pull request. Make sure all checks are green.
  3. Fix review comments if any.
  4. Be awesome.

Here are useful tips:

Comments
  • 0.0.6 release

    0.0.6 release

    Hi, thank you for this awesome plugin! Please consider creatng a new release that contains the changes introduced in the PR #14. Otherwise, the latest release on PyPI (0.0.5) raises on Python 3.9, forcing us to resort to install from source repo.

    Привет, ребята! Спасибо за отличный плагин к flake8! К сожалению, текущая версия на PyPI (0.0.5) кидает исключение в связке с Python 3.9 - фикс уже есть в основной ветке (PR #14). Прошу выпустить новую версию 0.0.6, содержащую этот фикс - пока приходится устанавливать плагин с мастер-ветки репозитория.

    enhancement 
    opened by hoefling 10
  • Variable annotations are ignored

    Variable annotations are ignored

    Here you only check function annotations: https://github.com/best-doctor/flake8-annotations-complexity/blob/master/flake8_annotations_complexity/ast_helpres.py#L17-L20

    However, it is still possible to use really complex variable annotations:

    some_value: List[Union[List[str], Dict[str, Dict[str, str]]]] = ...
    opened by sobolevn 2
  • Exception with Literal[

    Exception with Literal[""]

    An exception is thrown if running flake8 and it finds an empty string in a Literal definition.

    To Reproduce I wrote the test for it, so see that: https://github.com/best-doctor/flake8-annotations-complexity/pull/11

    Output:

    Traceback (most recent call last):
  File "/home/ubuntu/.local/bin/flake8", line 8, in <module>
    sys.exit(main())
  File "/home/ubuntu/.local/lib/python3.8/site-packages/flake8/main/cli.py", line 22, in main
    app.run(argv)
  File "/home/ubuntu/.local/lib/python3.8/site-packages/flake8/main/application.py", line 360, in run
    self._run(argv)
  File "/home/ubuntu/.local/lib/python3.8/site-packages/flake8/main/application.py", line 348, in _run
    self.run_checks()
  File "/home/ubuntu/.local/lib/python3.8/site-packages/flake8/main/application.py", line 262, in run_checks
    self.file_checker_manager.run()
  File "/home/ubuntu/.local/lib/python3.8/site-packages/flake8/checker.py", line 334, in run
    self.run_serial()
  File "/home/ubuntu/.local/lib/python3.8/site-packages/flake8/checker.py", line 318, in run_serial
    checker.run_checks()
  File "/home/ubuntu/.local/lib/python3.8/site-packages/flake8/checker.py", line 598, in run_checks
    self.run_ast_checks()
  File "/home/ubuntu/.local/lib/python3.8/site-packages/flake8/checker.py", line 505, in run_ast_checks
    for (line_number, offset, text, _) in runner:
  File "/home/ubuntu/.local/lib/python3.8/site-packages/flake8_annotations_complexity/checker.py", line 23, in run
    too_difficult_annotations = validate_annotations_in_ast_node(
  File "/home/ubuntu/.local/lib/python3.8/site-packages/flake8_annotations_complexity/ast_helpres.py", line 31, in validate_annotations_in_ast_node
    complexity = get_annotation_complexity(annotation)
  File "/home/ubuntu/.local/lib/python3.8/site-packages/flake8_annotations_complexity/ast_helpres.py", line 12, in get_annotation_complexity
    return 1 + get_annotation_complexity(annotation_node.slice.value)  # type: ignore
  File "/home/ubuntu/.local/lib/python3.8/site-packages/flake8_annotations_complexity/ast_helpres.py", line 8, in get_annotation_complexity
    annotation_node = ast.parse(annotation_node.s).body[0].value  # type: ignore
IndexError: list index out of range
    bug 
    opened by Dreamsorcerer 1
  • String expression in annotations

    String expression in annotations

    According PEP 3107 we can use any expression in annotations. Annotations like this:

    def foo() -> 'String Annontation':
    pass

    raises syntax error due to impossibility AST parsing this string:

    Traceback (most recent call last):
  File "/Users/andrey/.envs/test/bin/flake8", line 8, in <module>
    sys.exit(main())
  File "/Users/andrey/.envs/test/lib/python3.8/site-packages/flake8/main/cli.py", line 18, in main
    app.run(argv)
  File "/Users/andrey/.envs/test/lib/python3.8/site-packages/flake8/main/application.py", line 393, in run
    self._run(argv)
  File "/Users/andrey/.envs/test/lib/python3.8/site-packages/flake8/main/application.py", line 381, in _run
    self.run_checks()
  File "/Users/andrey/.envs/test/lib/python3.8/site-packages/flake8/main/application.py", line 300, in run_checks
    self.file_checker_manager.run()
  File "/Users/andrey/.envs/test/lib/python3.8/site-packages/flake8/checker.py", line 331, in run
    self.run_serial()
  File "/Users/andrey/.envs/test/lib/python3.8/site-packages/flake8/checker.py", line 315, in run_serial
    checker.run_checks()
  File "/Users/andrey/.envs/test/lib/python3.8/site-packages/flake8/checker.py", line 598, in run_checks
    self.run_ast_checks()
  File "/Users/andrey/.envs/test/lib/python3.8/site-packages/flake8/checker.py", line 502, in run_ast_checks
    for (line_number, offset, text, check) in runner:
  File "/Users/andrey/.envs/test/lib/python3.8/site-packages/flake8_annotations_complexity/checker.py", line 23, in run
    too_difficult_annotations = validate_annotations_in_ast_node(
  File "/Users/andrey/.envs/test/lib/python3.8/site-packages/flake8_annotations_complexity/ast_helpres.py", line 28, in validate_annotations_in_ast_node
    complexity = get_annotation_compexity(annotation)
  File "/Users/andrey/.envs/test/lib/python3.8/site-packages/flake8_annotations_complexity/ast_helpres.py", line 7, in get_annotation_compexity
    annotation_node = ast.parse(annotation_node.s).body[0].value  # type: ignore
  File "/Users/andrey/.pyenv/versions/3.8.0/lib/python3.8/ast.py", line 47, in parse
    return compile(source, filename, mode, flags,
  File "<unknown>", line 1
    String Annontation
           ^
SyntaxError: invalid syntax
    opened by leksuss 1
  • fails with AttributeError: 'Slice' object has no attribute 'value'

    fails with AttributeError: 'Slice' object has no attribute 'value' 

      File "/Users/ilebedev/.virtualenvs/amy/bin/flake8", line 8, in <module>
    sys.exit(main())
  File "/Users/ilebedev/.virtualenvs/amy/lib/python3.8/site-packages/flake8/main/cli.py", line 18, in main
    app.run(argv)
  File "/Users/ilebedev/.virtualenvs/amy/lib/python3.8/site-packages/flake8/main/application.py", line 393, in run
    self._run(argv)
  File "/Users/ilebedev/.virtualenvs/amy/lib/python3.8/site-packages/flake8/main/application.py", line 381, in _run
    self.run_checks()
  File "/Users/ilebedev/.virtualenvs/amy/lib/python3.8/site-packages/flake8/main/application.py", line 300, in run_checks
    self.file_checker_manager.run()
  File "/Users/ilebedev/.virtualenvs/amy/lib/python3.8/site-packages/flake8/checker.py", line 331, in run
    self.run_serial()
  File "/Users/ilebedev/.virtualenvs/amy/lib/python3.8/site-packages/flake8/checker.py", line 315, in run_serial
    checker.run_checks()
  File "/Users/ilebedev/.virtualenvs/amy/lib/python3.8/site-packages/flake8/checker.py", line 598, in run_checks
    self.run_ast_checks()
  File "/Users/ilebedev/.virtualenvs/amy/lib/python3.8/site-packages/flake8/checker.py", line 502, in run_ast_checks
    for (line_number, offset, text, check) in runner:
  File "/Users/ilebedev/.virtualenvs/amy/lib/python3.8/site-packages/flake8_annotations_complexity/checker.py", line 23, in run
    too_difficult_annotations = validate_annotations_in_ast_node(
  File "/Users/ilebedev/.virtualenvs/amy/lib/python3.8/site-packages/flake8_annotations_complexity/ast_helpres.py", line 28, in validate_annotations_in_ast_node
    complexity = get_annotation_compexity(annotation)
  File "/Users/ilebedev/.virtualenvs/amy/lib/python3.8/site-packages/flake8_annotations_complexity/ast_helpres.py", line 9, in get_annotation_compexity
    return 1 + get_annotation_compexity(annotation_node.slice.value)  # type: ignore
AttributeError: 'Slice' object has no attribute 'value'

    Code:

    
PROJECTS_INFO: Final[List[Tuple[int, str, str, str]]] = [
]
    opened by Melevir 1
  • Empty tuple annotation causes crash

    Empty tuple annotation causes crash

    I have some functions that deal with unions where one variant is the empty tuple. Per https://github.com/python/mypy/issues/4211, the way to represent the empty tuple type is typing.Tuple[()]. Using this annotation crashes flake8-annotations-complexity with the following traceback:

    Traceback (most recent call last):
  File "/Users/maxchase/.pyenv/versions/structured-data/bin/flake8", line 10, in <module>
    sys.exit(main())
  File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8/main/cli.py", line 18, in main
    app.run(argv)
  File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8/main/application.py", line 393, in run
    self._run(argv)
  File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8/main/application.py", line 381, in _run
    self.run_checks()
  File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8/main/application.py", line 300, in run_checks
    self.file_checker_manager.run()
  File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8/checker.py", line 331, in run
    self.run_serial()
  File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8/checker.py", line 315, in run_serial
    checker.run_checks()
  File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8/checker.py", line 598, in run_checks
    self.run_ast_checks()
  File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8/checker.py", line 502, in run_ast_checks
    for (line_number, offset, text, check) in runner:
  File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8_annotations_complexity/checker.py", line 25, in run
    self.max_annotations_complexity,
  File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8_annotations_complexity/ast_helpres.py", line 28, in validate_annotations_in_ast_node
    complexity = get_annotation_compexity(annotation)
  File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8_annotations_complexity/ast_helpres.py", line 9, in get_annotation_compexity
    return 1 + get_annotation_compexity(annotation_node.slice.value)  # type: ignore
  File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8_annotations_complexity/ast_helpres.py", line 11, in get_annotation_compexity
    return max(get_annotation_compexity(n) for n in annotation_node.elts)
  File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8_annotations_complexity/ast_helpres.py", line 11, in <genexpr>
    return max(get_annotation_compexity(n) for n in annotation_node.elts)
  File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8_annotations_complexity/ast_helpres.py", line 9, in get_annotation_compexity
    return 1 + get_annotation_compexity(annotation_node.slice.value)  # type: ignore
  File "/Users/maxchase/.pyenv/versions/3.7.4/envs/structured-data/lib/python3.7/site-packages/flake8_annotations_complexity/ast_helpres.py", line 11, in get_annotation_compexity
    return max(get_annotation_compexity(n) for n in annotation_node.elts)
ValueError: max() arg is an empty sequence

    I can put in a PR for this.

    opened by mwchase 1
  • `if annotation_len > 7:`

    `if annotation_len > 7:`

    annotation_len compares with constant 7 and not max_annotation_len :( But max_annotation_len is used in error message formatting.

    https://github.com/best-doctor/flake8-annotations-complexity/blob/master/flake8_annotations_complexity/ast_helpers.py#L65

    bug 
    opened by abcdenis 0
  • Add max complexity configuration from file

    Add max complexity configuration from file

    Is your feature request related to a problem? Please describe. The only documented method for configuring the max complexity is a command line switch. It is difficult to enforce a common standard in a shared codebase, or ensure CI is using the correct settings this way.

    Describe the solution you'd like A configuration option I can put in pyproject.toml to ensure the setting I desire is respected for all callers of flake8 in my repo.

    Describe alternatives you've considered Do nothing. Easiest, but it doesn't address the issue.

    Additional context N/A

    enhancement 
    opened by rpdelaney 0
Releases(v0.0.6)
Owner
BestDoctor
Check out our tech stack: https://stackshare.io/bestdoctor/bestdoctor
BestDoctor
GitHub Repository
Stubs with type annotations for ordered-set Python library

ordered-set-stubs - stubs with type annotations for ordered-set Python library Archived - now type annotations are the part of the ordered-set library

Roman Inflianskas 2 Feb 06, 2020
A static-analysis bot for Github

Imhotep, the peaceful builder. What is it? Imhotep is a tool which will comment on commits coming into your repository and check for syntactic errors

Justin Abrahms 221 Nov 10, 2022
Python classes with types validation at runtime.

typedclasses Python classes with types validation at runtime. (Experimental & Under Development) Installation You can install this library using Pytho

Izhar Ahmad 8 Feb 06, 2022
Pylint plugin to enforce some secure coding standards for Python.

Pylint Secure Coding Standard Plugin pylint plugin that enforces some secure coding standards. Installation pip install pylint-secure-coding-standard

Nguyen Damien 2 Jan 04, 2022
Collection of awesome Python types, stubs, plugins, and tools to work with them.

Awesome Python Typing Collection of awesome Python types, stubs, plugins, and tools to work with them. Contents Static type checkers Dynamic type chec

TypedDjango 1.2k Jan 04, 2023
A plugin for Flake8 finding likely bugs and design problems in your program. Contains warnings that don't belong in pyflakes and pycodestyle.

flake8-bugbear A plugin for Flake8 finding likely bugs and design problems in your program. Contains warnings that don't belong in pyflakes and pycode

Python Code Quality Authority 869 Dec 30, 2022
Flake8 extension for checking quotes in python

Flake8 Extension to lint for quotes. Major update in 2.0.0 We automatically encourage avoiding escaping quotes as per PEP 8. To disable this, use --no

Zachary Heller 157 Dec 13, 2022
Optional static typing for Python 3 and 2 (PEP 484)

Mypy: Optional Static Typing for Python Got a question? Join us on Gitter! We don't have a mailing list; but we are always happy to answer questions o

Python 14.4k Jan 08, 2023
Simple Python style checker in one Python file

pycodestyle (formerly called pep8) - Python style guide checker pycodestyle is a tool to check your Python code against some of the style conventions

Python Code Quality Authority 4.7k Jan 01, 2023
MonkeyType as a pytest plugin.

MonkeyType as a pytest plugin.

Marius van Niekerk 36 Nov 24, 2022
Tool to check the completeness of MANIFEST.in for Python packages

check-manifest Are you a Python developer? Have you uploaded packages to the Python Package Index? Have you accidentally uploaded broken packages with

Marius Gedminas 270 Dec 26, 2022
:sparkles: Surface lint errors during code review

✨ Linty Fresh ✨ Keep your codebase sparkly clean with the power of LINT! Linty Fresh parses lint errors and report them back to GitHub as comments on

Lyft 183 Dec 18, 2022
docstring style checker

pydocstyle - docstring style checker pydocstyle is a static analysis tool for checking compliance with Python docstring conventions. pydocstyle suppor

Python Code Quality Authority 982 Jan 03, 2023
Utilities for pycharm code formatting (flake8 and black)

Pycharm External Tools Extentions to Pycharm code formatting tools. Currently supported are flake8 and black on a selected code block. Usage Flake8 [P

Haim Daniel 13 Nov 03, 2022
Tool for automatically reordering python imports. Similar to isort but uses static analysis more.

reorder_python_imports Tool for automatically reordering python imports. Similar to isort but uses static analysis more. Installation pip install reor

Anthony Sottile 589 Dec 26, 2022
Silence mypy by adding or removing code comments

mypy-silent Automatically add or remove # type: ignore commends to silence mypy. Inspired by pylint-silent Why? Imagine you want to add type check for

Wu Haotian 8 Nov 30, 2022
flake8 plugin which checks that typing imports are properly guarded

flake8-typing-imports flake8 plugin which checks that typing imports are properly guarded installation pip install flake8-typing-imports flake8 codes

Anthony Sottile 50 Nov 01, 2022
Run isort, pyupgrade, mypy, pylint, flake8, and more on Jupyter Notebooks

Run isort, pyupgrade, mypy, pylint, flake8, mdformat, black, blacken-docs, and more on Jupyter Notebooks ✅ handles IPython magics robustly ✅ respects

663 Jan 08, 2023
Flake8 Type Annotation Checking

flake8-annotations flake8-annotations is a plugin for Flake8 that detects the absence of PEP 3107-style function annotations and PEP 484-style type co

S. Co1 118 Jan 05, 2023
flake8 plugin to catch useless `assert` statements

flake8-useless-assert flake8 plugin to catch useless assert statements Download or install on the PyPI page Violations Code Description Example ULA001

1 Feb 12, 2022