--- title: Best Planet Python posts — September 2025 | daily.dev description: The most upvoted Planet Python posts from September 2025, curated by the daily.dev community. canonical: https://daily.dev/sources/planetpython/best-of/2025/09 twitter:card: summary_large_image twitter:site: @dailydotdev og:url: https://daily.dev/sources/planetpython/best-of/2025/09 og:type: website og:site_name: daily.dev og:title: Best Planet Python posts — September 2025 | daily.dev og:description: The most upvoted Planet Python posts from September 2025, curated by the daily.dev community. og:image: https://media.daily.dev/image/upload/s--VAY5ToZt--/f_auto/v1724209435/public/daily.dev%20-%20open%20graph --- # Best of Planet Python — September 2025 1. 1 [](https://daily.dev/posts/uv-cheatsheet-jugh4f1ft "uv cheatsheet") Article Planet Python·52w uv cheatsheet A comprehensive command reference for uv, the fast Python package manager and project management tool. Covers essential commands for creating projects, managing dependencies, building and publishing packages, working with scripts, managing Python versions, and using tools in isolated environments. Includes practical examples for common workflows like adding/removing dependencies, version bumping, and running scripts with specific Python versions. 43 2. 2 [](https://daily.dev/posts/python-memory-tricks-to-boost-performance-akqzsb4do "Python Memory Tricks to Boost Performance") Article Planet Python·52w Python Memory Tricks to Boost Performance Comprehensive guide covering practical Python memory optimization techniques including generators for lazy loading, \_\_slots\_\_ for reducing object overhead, weak references for cache management, string interning, smart data structure choices, chunked file processing, and leveraging Python 3.13's mimalloc. Includes ready-to-use code examples and memory profiling tools to help developers reduce RAM usage by 40-60% in large applications. 21 3. 3 [](https://daily.dev/posts/til-loading-env-files-with-uv-run-pv88o7hqj "TIL: Loading .env files with uv run") Article Planet Python·49w TIL: Loading .env files with uv run The uv package manager includes built-in support for loading environment variables from .env files using the --env-file flag with uv run, eliminating the need for python-dotenv dependency. This feature allows developers to specify different environment files for various deployment stages and works seamlessly with frameworks like FastAPI. 10 [See all Planet Python archives](/sources/planetpython/best-of) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@graph":[{"@type":"CollectionPage","@id":"https://daily.dev/sources/planetpython/best-of/2025/09#page","url":"https://daily.dev/sources/planetpython/best-of/2025/09","name":"Best Planet Python Posts — September 2025","description":"The most upvoted Planet Python posts from September 2025, curated by the daily.dev community.","isPartOf":{"@type":"WebSite","url":"https://daily.dev"}},{"@type":"ItemList","@id":"https://daily.dev/sources/planetpython/best-of/2025/09#items","numberOfItems":3,"itemListElement":[{"@type":"ListItem","position":1,"url":"https://daily.dev/posts/uv-cheatsheet-jugh4f1ft","name":"uv cheatsheet"},{"@type":"ListItem","position":2,"url":"https://daily.dev/posts/python-memory-tricks-to-boost-performance-akqzsb4do","name":"Python Memory Tricks to Boost Performance"},{"@type":"ListItem","position":3,"url":"https://daily.dev/posts/til-loading-env-files-with-uv-run-pv88o7hqj","name":"TIL: Loading .env files with uv run"}]},{"@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Sources","item":"https://daily.dev/sources"},{"@type":"ListItem","position":3,"name":"Planet Python","item":"https://daily.dev/sources/planetpython"},{"@type":"ListItem","position":4,"name":"Best of","item":"https://daily.dev/sources/planetpython/best-of"},{"@type":"ListItem","position":5,"name":"September 2025"}]}]} ```