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 […]
AOSU Doorbell Camera
My analog doorbell has died, so I am on the market for a doorbell camera. I would like to avoid storing my videos in the cloud, so it rules out […]
What is dead code?
What is dead code? Looks like it depends on who you ask. Some people think it’s unreachable code than never executes. Other people think that it’s redundant code that does […]
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() […]
Python: assignment in lambdas
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 […]
Docker multi-platform images
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” […]