Hello, IT! Have you tried turning it on and off again? (Mobile Hotspot)
Yesterday, I had an Internet outage at home. The Internet was down for several hours. This is a perfect time to use Mobile hotspot. But alas, it wasn’t working. I […]
Hacker’s diary
Python: modifying imported value
TL;DR: Python statement from module import obj creates a copy of the object in the importing scope. In other words, from module import obj is roughly equivalent to obj = __import__(‘module’).obj. […]
RabbitMQ: misleading error message on double [N]ack
Our RabbitMQ client written in Go failed with the following error message: rabbitmq | 2024-10-23 17:54:01.311544+00:00 [error] operation basic.ack caused a channel exception precondition_failed: unknown delivery tag {message_tag} Taken at […]
The Night of the Zombie Registrars
TL;DR Before transferring a new domain to a registrar, contact support, and make sure there are still live humans behind the robots. If there aren’t, RUN!!! UPDATE I’ve got my […]
Turing Test Passed Successfully
Last night I was talking to something which could be a human or a robot, I could not tell. But that’s not necessarily a good thing: not only AI became […]
Python generator expression can be iterated only once
TL;DR Python generator expressions can be iterated over only once. I mentally mapped Python generator expressions to C# IEnumerables, which can be iterated over multiple times. In reality, Python generator […]
Python: serializing JSON into dataclasses with validation
TL;DR use marshmallow-dataclass. Serializing JSON into dataclasses with validation proved to be unexpectedly difficult. By “validation” here I mean type checking (this must be a valid integer), range checking (this […]
Python methods vs callable attributes and (deep)copy
This post describes more fundamental underpinnings of how copy and deepcopy interact with callable attributes. See previous post for some practical examples of unexpected behavior. Methods vs Instance Attributes Consider […]
Python: dynamic methods and object copying, a tale of one bug
Executive Summary Avoid using callable instance attributes that call back into the object that contains them. If you must, make the object uncopyable by overriding __copy__ and __deepcopy__ and raising […]
Python eval: difference between globals and locals
Python eval() receives two optional dictionaries: globals and locals. I was finally able to find at least two differences between them. First difference: global variables survive until after the eval() […]