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Get started with Pyrefly:
This code looks completely fine — it even runs — right up until it crashes on a line that should never have shipped. Python won't warn you, because it doesn't check types until your code is actually running.
In this video I show you Pyrefly, Meta's new static type checker for Python. It's free, it's open source, and it's already running in production at Instagram and PyTorch. I'll show you exactly why Python lets these bugs slip through, why type hints alone don't save you, and how Pyrefly catches these errors before you ever hit run.
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Get started with Pyrefly:
Migrate from your current typechecker:
Get your agent to use Pyrefly:
⏳ Timestamps ⏳
00:00 | Overview
00:33 | Dynamic Typing
03:44 | Type Hints in Python
05:20 | What is a Static Type Checker
07:10 | Pyrefly Install
07:52 | Using Pyrefly
09:41 | Migration from mypy
11:33 | Type Checking Demo
13:19 | Speed Test
15:20 | Using Pyrefly from Agents
Hashtags
#Python #Pyrefly #TypeChecking
UAE Media License Number: 3635141
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2026/09/29
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