Python
Debugging asyncio Deadlocks and the Blocking Call Checklist
Your async service handles ten requests a second and pegs one core. Somewhere a synchronous call is blocking the event loop.
Bug Hunt
The Bug That Only Happened on Tuesdays
A weekly export failed every Tuesday and worked every other day. Three wrong hypotheses later, the cause was a date format string nobody had looked at in four years.
Python
How to Read a Python Traceback Properly (Most Developers Read It Backwards)
The last line tells you what broke. The middle tells you why. Here is how to get a working hypothesis out of a traceback in about ten seconds.
AI
The Package Your AI Assistant Recommended Does Not Exist
Models invent plausible package names. Attackers register them. Here is why this attack works and the two checks that stop it.
Python
ModuleNotFoundError Even Though You Definitely Installed It
pip says it is installed, python says it is not. Both are telling the truth about different Pythons.