Simon Willison’s Weblog

The Observer Pattern in Python (via) Makes smart use of weak references.

Posted 16th June 2004 at 11:55 pm

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Video: Building a tool to copy-paste share terminal sessions using Claude Code for web - 23rd October 2025
Dane Stuckey (OpenAI CISO) on prompt injection risks for ChatGPT Atlas - 22nd October 2025
Living dangerously with Claude - 22nd October 2025

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