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 […]
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 […]
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() 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() […]
TL;DR Use default parameters to simulate assignment in lambdas. Unlike C and C++, in Python assignment is an expression, not a statement. Python lambda can only return an expression, which […]
Invalid Exec Format They gave me a MacBook Pro at work. I built a docker image locally. I pushed it to Amazon cloud to run. I got “invalid exec format” […]
TL;DR make sure to add magic words WSGIApplicationGroup %{GLOBAL} to the Apache config, otherwise import torch will hang. I tried to integrate my PyTorch AI model with my Apache web […]
I have Synology NAS, and I share the “home” directory as a CIFS share. From Windows, I simply do net use N: \\home\nas /user:myuser *, and it works. Corresponding command […]
I have discovered a few broken things with my WordPress site. This post, as much of this blog, is mostly description of events, so I won’t forget what exactly happened. […]
TL;DR Don’t mix set -e and && operators in bash, it’s not going to work well. What is ‘set -e’ Bash command set -e stops the script when any of […]
