Simon Willison’s Weblog

11th August 2024 - Link Blog

PEP 750 – Tag Strings For Writing Domain-Specific Languages. A new PEP by Jim Baker, Guido van Rossum and Paul Everitt that proposes introducing a feature to Python inspired by JavaScript's tagged template literals.

F strings in Python already use a f"f prefix", this proposes allowing any Python symbol in the current scope to be used as a string prefix as well.

I'm excited about this. Imagine being able to compose SQL queries like this:

query = sql"select * from articles where id = {id}"

Where the sql tag ensures that the {id} value there is correctly quoted and escaped.

Currently under active discussion on the official Python discussion forum.