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today I talk about an extremely common mistake with it's here! with ugly new typing syntax and infinitely nestable fstrings and one of the funniest changes I've seen in a while -- today we go over narrowings and `TypeGuard` -- which enables you to write your own user-defined narrowings! playlist: ... today I go over all the tools I use to set up my projects, as well as the differences between 1-file libraries, multi-file libraries, and ... I build out a simple skeleton for a command line interface in the dreaded "E722 do not use bare 'except'"! today we
today I talk about the decorator for typing and how it can be used to signal typed-dispatch to a type checker! today I talk about `ExitStack` and a few uses of it: conditional contexts, variable contexts - context managers the hard way: ... this is the first thing I always do before opening a github issue! playlist: ... today I talk about the `source` command -- why it exists, and why I prefer `.` over `source`! playlist: ... today I show a quick introduction to type annotating code in today I describe the history lore of pytest and how an errant CVE led to finally deleting the py library -- I show the clever trick I use ...
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Last Updated: June 7, 2026
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I realize I've talked a lot about pytest on the channel, but never given it a proper introduction! - testing a cli with pytest: ... today I show how to use importlib.metadata + setuptools entrypoints to build a small plugin system! playlist: ... today I talk about a little trick utilizing object() and why you might also need the same thing! playlist: ... I totally missed this improvement when reviewing 3.12 back in the day and it's pretty significant. but I think they missed one key ...
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