flake8-comprehensions
A flake8 plugin to help you write better list/set/dict comprehensions.
Decision gist · record as of 2026-08-14
Yes. The plugin is actively maintained, has no known vulnerabilities, and low install friction. It fills a specific and well-defined niche—catching comprehension anti-patterns—that most general linters do not cover. Install it if your team values code idiomaticity and performance-conscious Python style.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.9 or later.
- Low friction: a pure-Python wheel with only flake8 as a runtime dependency.
- Actively maintained with a recent release and no known vulnerabilities.
License · maintenance · safety
MIT (permissive) — MIT license permits unrestricted use, modification, and distribution in both open-source and commercial projects.
last release 2025-09-09 (339 days) · last repo commit 2026-08-13 · 465 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 1,872,035 downloads/mo, #3,471 on PyPI
Alternatives
Verify before relying
pip install flake8-comprehensions
Then add C4 to flake8's select setting if defined, or it activates by default. Run flake8 on your code to see violations like C400-C417.What it is and what it does
flake8-comprehensions is a flake8 plugin that analyzes Python code to identify and flag inefficient or redundant patterns involving comprehensions, generators, and built-in type constructors. It enforces a suite of rules (C400–C417) that catch common mistakes: unnecessary generator expressions wrapped in list/set/dict calls, list comprehensions passed to set/dict constructors, redundant literal syntax, and inefficient double-casting of iterables. The plugin integrates directly into flake8's linting pipeline.
When installed, it runs automatically as part of flake8's checks (unless explicitly disabled via configuration). It emits specific error codes and suggestions for how to rewrite each pattern more idiomatically—for example, replacing `list(x for x in foo)` with `[x for x in foo]` or `set([1, 2])` with `{1, 2}`. The plugin is particularly useful in codebases that prioritize readability and performance, helping developers adopt Pythonic idioms consistently.
Use it for
- Enforce consistent comprehension style across a team codebase during CI/CD linting.
- Catch performance anti-patterns like unnecessary generator wrapping or double-casting in code review.
- Teach Python developers idiomatic comprehension syntax and when to use set/dict literals.
- Identify redundant list comprehensions that can be simplified to direct set() or dict() calls.
- Flag inefficient sorted() or reversed() patterns that can be optimized with built-in arguments.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
The plugin is actively maintained, has no known vulnerabilities, and low install friction. It fills a specific and well-defined niche—catching comprehension anti-patterns—that most general linters do not cover. Install it if your team values code idiomaticity and performance-conscious Python style.
Install
flake8-comprehensions on PyPI
Before you install
Low friction: a pure-Python wheel with only flake8 as a runtime dependency. Actively maintained with a recent release and no known vulnerabilities.
Requires Python 3.9 or later.
License in practice
MIT license permits unrestricted use, modification, and distribution in both open-source and commercial projects.
Quickstart
pip install flake8-comprehensions
Then add C4 to flake8's select setting if defined, or it activates by default. Run flake8 on your code to see violations like C400-C417.Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.9 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packageflake8 |
| Maintenance | Actively maintained 339 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 1,872,035 / month, #3,471 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableFramework :: Flake8Intended Audience :: DevelopersNatural Language :: EnglishProgramming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: 3.9Typing :: Typed |
Evidence: flake8_comprehensions-3.17.0-py3-none-any.whl
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See also flake8-pie · flake8-return · flake8-bugbear · flake8_simplify · flake8-tuple · flake8-tidy-imports · flake8-picky-parentheses · flake8-implicit-str-concat · flake8-commas · cython-lint