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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My Lethal Trifecta talk at the Bay Area AI Security Meetup - 9th August 2025
The surprise deprecation of GPT-4o for ChatGPT consumers - 8th August 2025
GPT-5: Key characteristics, pricing and model card - 7th August 2025

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