Jelle Zijlstra

This site hosts a few articles about my open-source software work:

• Notes on the CPython project, my view of some common conventions and norms on the CPython open-source project
• PEP 695, a deep dive into the implementation of PEP 695 - Type Parameter Syntax
• Typing Council, some thoughts on my role on the Typing Council.
• Improving the ast module in Python 3.13, notes on how the ast module is changing in Python 3.13.
• Odd annotations, some odd or unexpected behaviors around annotations in Python
• Why can’t we …?, problems with some commonly suggested usability improvements for Python typing

Talks

I have given talks and posters at various conferences over the years. This section lists those I was able to find back.

See also a list of my publications at my Hesperomys database.

Biology

• The Westernmost Tarsier: A new genus and species from the Miocene of Pakistan (talk; Society of Vertebrate Paleontologists, Raleigh, NC, 2012)
• Cataloging Animal Names with Python (lightning talk; PyCon US, Cleveland, OH, 2019)
• Messages in a bottle: Small mammal bones from discarded bottles (poster; American Society of Mammalogists, Anchorage, AK, 2023)
• Even old names can be new: changes in mammalian nomenclature since 2005 (talk; Jelle Zijlstra, Connor Burgin & Nate Upham, American Society of Mammalogists, Boulder, CO, 2024)

Software

• Asynchronous Programming at Quora (talk; Pyninsula, Mountain View, CA, 2019)
• pyanalyze: a semi-static typechecker (talk; Python typing online meetup, 2019)
• The future of typeshed (talk; Typing Summit, PyCon US, Cleveland, OH, 2019)
• Too small for a PEP: minor new typing features in Python 3.11 (talk; Typing Summit, PyCon US, Salt Lake City, UT, 2022)
• PEP 688: Typing for the buffer protocol (lightning talk; PyCon US, Salt Lake City, UT, 2022)
• Typing support for deprecations and errors (talk; Python typing online meetup, 2022)
• State of Typing (talk; Typing Summit, PyCon US, Salt Lake City, UT, 2023)
• PEP 695; or, how typing syntax led to a scoping rabbit hole (talk; PyCon US, Pittsburgh, PA, 2024)
• Typing Summit (introductory talk; jointly with other organizers and members of the Typing Council; Typing Summit, PyCon US, Pittsburgh, PA, 2024)