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# Modern Python Weekly #6
- URL: https://modernpython.io/modern-python-weekly-6/
- Published: 2026-07-24T13:28:24.000Z
- Updated: 2026-07-24T13:28:24.000Z
- Description: Python 3.15 beta hardens, Django 6.1 RC1 lands, and Kimi K3 raises the pressure on the AI model race.
- Author: Modern Python
- Tags: Newsletter

## Python News

- [Python 3.15.0 beta 4 is here!](https://blog.python.org/2026/07/python-3150-beta-4/?ref=modernpython.io) \- Released July 18, 2026 as the final planned beta, with nearly 300 fixes before the first release candidate scheduled for August 4\.
- [FastAPI 0.139.2](https://github.com/fastapi/fastapi/releases/tag/0.139.2?ref=modernpython.io) \- Released July 16, 2026 with a thread-safety fix in router route building, a narrow patch that still matters for parallelized test suites and larger CI setups teams are running this week.
- [Polars py-1.43.0](https://github.com/pola-rs/polars/releases/tag/py-1.43.0?ref=modernpython.io) \- Released July 21, 2026 with new exponential weighted expressions, more Iceberg support, and a long list of streaming, join, and cloud-IO improvements.
- [Django 6.1 release candidate 1 released](https://www.djangoproject.com/weblog/2026/jul/22/django-61-rc1-released/?ref=modernpython.io) \- Released July 22, 2026 as a preview build for the upcoming Django 6.1 release, which the official docs still list as expected in August 2026 rather than already final.

## AI news

- [Introducing OpenAI Presence](https://openai.com/index/introducing-openai-presence/?ref=modernpython.io) \- Announced July 22, 2026 as a limited-availability enterprise product for deploying policy-bound AI agents across customer support and internal workflows.
- [Kimi K3 July 16, 2026](https://www.kimi.com/code/docs/en/kimi-code/whats-new.html?ref=modernpython.io) \- Moonshot's Kimi docs say Kimi K3 was released and open-sourced on July 16, 2026 as a 2.8-trillion-parameter multimodal model with a 1M-token context window aimed at long-horizon coding and agent work. *💡 Modern Python's Take: Kimi K3 matters less as a benchmark headline than as another sign that frontier coding and agent models are becoming globally competitive, open-weight, and harder for U.S. labs to price above on brand alone.*
- [OpenAI and Hugging Face partner to address security incident during model evaluation](https://openai.com/index/hugging-face-model-evaluation-security-incident/?ref=modernpython.io) \- Published July 21, 2026, detailing how an internal cyber-capability evaluation led to an AI-driven intrusion on Hugging Face infrastructure and triggered remediation on both sides.
- [Safety and alignment in an era of long-horizon models](https://openai.com/index/safety-alignment-long-horizon-models/?ref=modernpython.io) \- Published July 20, 2026, describing how longer-running models exposed novel failure patterns during internal deployment and forced a pause plus safeguard redesign.

## Tools and Projects

- [uv 0.11.32](https://github.com/astral-sh/uv/releases/tag/0.11.32?ref=modernpython.io) \- Released July 23, 2026 as the latest packaging-tool update in Astral's rapid cadence, continuing the stream of installer, resolver, and Python-management refinements.
- [Ruff 0.16.0](https://github.com/astral-sh/ruff/releases/tag/0.16.0?ref=modernpython.io) \- Released July 23, 2026 with notebook, editor, and lint-rule updates as Ruff keeps extending beyond "fast linter" into a broader Python editing substrate.
- [Introducing Cosmos 3 Edge](https://huggingface.co/blog/nvidia/cosmos3edge?ref=modernpython.io) \- Published July 20, 2026, NVIDIA's open 4B world model aimed at robotics and edge physical-AI deployments on constrained hardware.

## Articles

- [What building Shippy taught us about building agents](https://huggingface.co/blog/allenai/shippy-tech-blog?ref=modernpython.io) \- Published July 15, 2026, Ai2's engineering write-up on making a maritime analysis agent reliable through constrained tools, sandbox isolation, and task-level evaluation.
- [Model Routing Is Simple. Until It Isn’t.](https://huggingface.co/blog/ibm-research/model-routing-is-simple-until-it-isnt?ref=modernpython.io) \- Published July 15, 2026, IBM Research's argument that routing agents across models is an optimization problem spanning quality, cost, latency, and governance.
- [Towards demystifying the creativity of diffusion models](https://research.google/blog/?debug=true&ref=modernpython.io) \- Published July 15, 2026 on the Google Research blog, examining how diffusion models produce outputs that look creative without treating the system as pure black-box magic.
- [The Making of Claude Code](https://www.anthropic.com/features/making-of-claude-code?ref=modernpython.io) \- Anthropic's July 2026 feature on how its coding agent evolved from internal CLI tooling into a product shaped by researchers, engineers, and early users.