Posts

I knew timezones were hard but I learned a new tripping hazard and I learned it the fun way: in production. In this post I’ll explain why there are 67 minutes between 8am and 9am in the code below: >>> import datetime >>> import pytz >>> t1 = datetime.datetime(2024,12,25,8,tzinfo=pytz.timezone("US/Pacific")) >>> t2 = datetime.datetime.fromtimestamp(1735146000, tz=pytz.timezone("US/Pacific")) >>> t2 - t1 datetime.timedelta(seconds=4020) >>> 4020 / 60 67.0 >>> t1 >= t2-datetime.timedelta(minutes=60) False >>> t1+datetime....

My friend had a broken coupler on his blender. So I designed a new one using OpenSCAD. Its a form of Computer Aided Design (CAD) which which uses scripting to add and subtract solids from each other. The whole project in in this repo. The part which broke is the bottom of the cup that engages with the teeth in the base of the blender. Here is a picture of the base....

Número De Identificação Fiscal or NIF, is the nine digit number which is used to identify a tax paying entity in Portugal. Any NIF can be validated using the mod 11 algorithm with one twist. I will describe what that twist is and how it affects validating a NIF. When you buy anything in Portugal, in person or online, you give your NIF. This includes everything from the 100€ you spend on your mall haul, to the 2€ you spend on an espresso and a pastel de nata....