# Pynions: Python News for Builders > Library comparisons, framework reviews, tooling decisions, and what's shipping this week.

## Site Files
- [Sitemap](https://pynions.com/sitemap.xml): Complete XML sitemap for this publication.
- [RSS Feed](https://pynions.com/feed): Latest published articles in RSS format.

## Latest Posts
- [Streamlit: The Rerun Model Before the Widgets](https://pynions.com/streamlit): Streamlit turns a Python script into a data app by rerunning the whole file. Covers session state, cache, Community Cloud caps, and when FastAPI wins.
- [Python vs JavaScript: Where Each Wins](https://pynions.com/python-vs-javascript): Python wins data, ML, and automation; JavaScript wins the browser, and Node.js wins I/O-heavy APIs. If you can pick only one, pick the job.
- [Python Context Managers: with, contextlib, and Async](https://pynions.com/context-manager-python): A Python context manager is the with protocol: __enter__/__exit__, contextlib helpers, custom classes, and async with. Files are an example, not the definition.
- [Python Decorators, Explained as a Name Swap](https://pynions.com/what-is-python-decorators): A Python decorator is a function that returns another function, usually applied with @wrapper syntax so the returned callable replaces the original name.
- [3 Python Linters Compared by Speed and Depth](https://pynions.com/python-linter): Compare three Python linters: Ruff, Flake8, and Pylint. Speed, rule coverage, Flake8 drop-in vs Pylint residual, VS Code setup, and when to keep each one.
- [The 9-Step Scrapy Loop Most Scripts Rebuild](https://pynions.com/scrapy): Scrapy is a crawl framework, not a parser. Learn the Engine loop, spiders, item pipelines, and when a requests + BeautifulSoup script still wins.
- [LlamaIndex Playbook: RAG, Agents, and Production Gotchas](https://pynions.com/llamaindex): LlamaIndex for Python: RAG, agents, LlamaParse, LiteParse v2.1, vs LangChain, and the silent OpenAI fallback.
- [Streamlit vs Gradio: Two Python Frameworks for Different Jobs](https://pynions.com/streamlit-vs-gradio)
- [Pydantic AI v2: Build and Ship Production Python Agents](https://pynions.com/pydantic-ai): Pydantic AI v2: type-safe Python agents with structured outputs, DI, and Logfire. Covers v2.0.0 Capabilities, deterministic evals, and LangChain comparison.
- [mypy vs pyright: Two Checkers, One Pipeline, and a Speed Surprise](https://pynions.com/mypy-vs-pyright): mypy catches 57% of type errors by default; pyright catches 97%. But mypy 2.1 now outruns pyright on batch CI. Here is the full 2026 breakdown.
- [Should You Replace Black with Ruff?](https://pynions.com/ruff-vs-black): Ruff has overtaken Black in monthly downloads and runs 30x faster. Here is when to switch and when to stay.
- [pytest vs unittest: Why Most Python Devs End Up Using Both](https://pynions.com/pytest-vs-unittest): pytest wins on features and developer adoption; unittest ships with Python. The practical story: pytest runs unittest tests natively, so most teams use both.
- [uv Python: Replace Your Entire Toolchain With One Binary](https://pynions.com/uv-python): uv replaces pip, pyenv, virtualenv, pip-tools, and pipx with one Rust binary. Complete guide to installation, commands, Docker integration, and migration paths.
- [Ruff Python: The 0.18-Second Linter That Replaced Five Tools in One](https://pynions.com/ruff-python): A complete guide to installing, configuring, and migrating to Ruff — the Rust-powered Python linter and formatter that replaces Flake8, Black, isort, and more a
- [Polars Python: Faster ETL and Automation Scripts with Lazy Evaluation](https://pynions.com/polars-python): Learn Polars Python with real code examples and 2026 benchmarks. Filter 14 GB Parquet 11x faster than pandas using lazy evaluation.
- [Dagster Guide: Build Asset-Centric Data Pipelines in Python (2026)](https://pynions.com/dagster): Dagster's Software-Defined Assets model data pipelines as graphs of assets, not sequences of tasks. This guide covers the 2026 quickstart toolchain, dbt integra
- [LangChain vs LlamaIndex: Pick the Right Python AI Framework](https://pynions.com/llamaindex-vs-langchain): LangChain wins for stateful multi-agent orchestration and the broadest integration surface. LlamaIndex wins when retrieval accuracy over private documents is th
- [Playwright vs Selenium: Which Should Python Developers Use?](https://pynions.com/playwright-vs-selenium): Playwright wins for new Python projects in 2026. It runs 44% faster than Selenium on React SPAs, eliminates flaky waits with built-in auto-waiting, and ships bo
- [FastAPI vs Django: What the Benchmarks Get Wrong](https://pynions.com/fastapi-vs-django): FastAPI wins for async I/O and AI backends; Django wins for full-stack apps with admin panels. Real benchmarks, async pitfalls, and the hybrid architecture most
- [uv vs Poetry: Speed, Lock-in, and When to Switch](https://pynions.com/uv-vs-poetry): uv is 4–16× faster than Poetry and replaces 7 Python tools in one binary. Poetry still wins for PyPI library publishing. A 2026 decision guide.

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## Tags
- [AI](https://pynions.com/tags/ai)
- [Agents](https://pynions.com/tags/agents)
- [Alternatives](https://pynions.com/tags/alternatives)
- [Analytics](https://pynions.com/tags/analytics)
- [Automation](https://pynions.com/tags/automation)
- [Data](https://pynions.com/tags/data)
- [LangChain](https://pynions.com/tags/langchain)
- [Microsoft Teams](https://pynions.com/tags/microsoft-teams)
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- [Pandas](https://pynions.com/tags/pandas)
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- [Slack](https://pynions.com/tags/slack)
- [Statistics](https://pynions.com/tags/statistics)
- [Tools](https://pynions.com/tags/tools)

## Contributors
- [Tomas Laurinavicius](https://pynions.com/author/tomaslau): Python Developer and Partner at Craftled
- [Laupix](https://pynions.com/author/laupix): AI coworker