October 09, 2025

#452 pi py-day (or is it py pi-day?)

40 minutes

Topics covered in this episode:

Python 3.14

Free-threaded Python Library Compatibility Checker

Claude Sonnet 4.5

Python 3.15 will get Explicit lazy imports

Extras

Joke

Watch on YouTube

About the show

Sponsored by DigitalOcean: pythonbytes.fm/digitalocean-gen-ai Use code DO4BYTES and get $200 in free credit

Connect with the hosts

Michael: @[email protected] / @mkennedy.codes (bsky)

Brian: @[email protected] / @brianokken.bsky.social

Show: @[email protected] / @pythonbytes.fm (bsky)

Join us on YouTube at pythonbytes.fm/live to be part of the audience. Usually Monday at 10am PT. Older video versions available there too.

Finally, if you want an artisanal, hand-crafted digest of every week of the show notes in email form? Add your name and email to our friends of the show list, we'll never share it.

Brian #1: Python 3.14

Released on Oct 7

What’s new in Python 3.14

Just a few of the changes

PEP 750: Template string literals

PEP 758: Allow except and except* expressions without brackets

Improved error messages

Default interactive shell now

highlights Python syntax

supports auto-completion

argparse

better support for python -m module

has a new suggest_on_error parameter for “maybe you meant …” support

python -m calendar now highlights today’s date

Plus so much more

Michael #2: Free-threaded Python Library Compatibility Checker

by Donghee Na

App checks compatibility of top PyPI libraries with CPython 3.13t and 3.14t, helping developers understand how the Python ecosystem adapts to upcoming Python versions.

It’s still pretty red, let’s get in the game everyone!

Michael #3: Claude Sonnet 4.5

Top programming model (even above Opus 4.1)

Shows large improvements in reducing concerning behaviors like sycophancy, deception, power-seeking, and the tendency to encourage delusional thinking

Anthropic is releasing the Claude Agent SDK, the same infrastructure that powers Claude Code, making it available for developers to build their own agents, along with major upgrades including checkpoints, a VS Code extension, and new context editing features

And Claude Sonnet 4.5 is available in PyCharm too.

Brian #4: Python 3.15 will get Explicit lazy imports

Discussion on discuss.python.org

This PEP introduces syntax for lazy imports as an explicit language feature:

lazy import json

lazy from json import dumps

BTW, lazy loading in fixtures is a super easy way to speed up test startup times.

Extras

Brian:

Music video made in Python - from Patrick of the band “Friends in Real Life”

source code: https://gitlab.com/low-capacity-music/r9-legends/

Michael:

New article: Thanks AI

Lots of updates for content-types

Dramatically improved search on Python Bytes (example: https://pythonbytes.fm/search?q=wheel use the filter toggle to see top hits)

Talk Python in Production is out and for sale

Joke: You do estimates?

...more

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By Michael Kennedy and Brian Okken

4.7

212212 ratings

October 09, 2025

#452 pi py-day (or is it py pi-day?)

40 minutes

Topics covered in this episode:

Python 3.14

Free-threaded Python Library Compatibility Checker

Claude Sonnet 4.5

Python 3.15 will get Explicit lazy imports

Extras

Joke

Watch on YouTube

About the show

Sponsored by DigitalOcean: pythonbytes.fm/digitalocean-gen-ai Use code DO4BYTES and get $200 in free credit

Connect with the hosts

Michael: @[email protected] / @mkennedy.codes (bsky)

Brian: @[email protected] / @brianokken.bsky.social

Show: @[email protected] / @pythonbytes.fm (bsky)

Join us on YouTube at pythonbytes.fm/live to be part of the audience. Usually Monday at 10am PT. Older video versions available there too.

Finally, if you want an artisanal, hand-crafted digest of every week of the show notes in email form? Add your name and email to our friends of the show list, we'll never share it.

Brian #1: Python 3.14

Released on Oct 7

What’s new in Python 3.14

Just a few of the changes

PEP 750: Template string literals

PEP 758: Allow except and except* expressions without brackets

Improved error messages

Default interactive shell now

highlights Python syntax

supports auto-completion

argparse

better support for python -m module

has a new suggest_on_error parameter for “maybe you meant …” support

python -m calendar now highlights today’s date

Plus so much more

Michael #2: Free-threaded Python Library Compatibility Checker

by Donghee Na

App checks compatibility of top PyPI libraries with CPython 3.13t and 3.14t, helping developers understand how the Python ecosystem adapts to upcoming Python versions.

It’s still pretty red, let’s get in the game everyone!

Michael #3: Claude Sonnet 4.5

Top programming model (even above Opus 4.1)

Shows large improvements in reducing concerning behaviors like sycophancy, deception, power-seeking, and the tendency to encourage delusional thinking

And Claude Sonnet 4.5 is available in PyCharm too.

Brian #4: Python 3.15 will get Explicit lazy imports

Discussion on discuss.python.org

This PEP introduces syntax for lazy imports as an explicit language feature:

lazy import json

lazy from json import dumps

BTW, lazy loading in fixtures is a super easy way to speed up test startup times.

Extras

Brian:

Music video made in Python - from Patrick of the band “Friends in Real Life”

source code: https://gitlab.com/low-capacity-music/r9-legends/

Michael: