All Questions
Tagged with python-3.x meta-programming
32 questions
1
vote
2
answers
150
views
Python 3.10+ deconstructing an over engineered solution to better understand how metaclasses work with properties, static methods, and classmethods
TL;DR
This question examines an over-engineered example of python metaclasses and dataclasses to create a LiteralEnum (for validating a stringly-typed keyword ...
- 291
1
vote
3
answers
465
views
Decorator to validate that Python function arguments are positive
I have a list of functions whose parameters in the signature should be validated with the same criteria each time.
...
- 199
3
votes
1
answer
183
views
Lightweight interface implementation in Python 3 using abstract classes
Here is my take at a lightweight interface implementation, where I focus on discoverability of suitable classes from strings (for simplicity, class name is used as an id). Each interface has it's own &...
- 973
6
votes
2
answers
500
views
LazyEnum with validation
Motivation
In the standard Python library enum, a subclass of Enum would create all its members upon class creation. This can ...
- 256
4
votes
1
answer
149
views
A self contained parser generator implementation
This is a recreational project, I was trying to make a parser generator with a grammar inspired from: https://docs.python.org/3/reference/grammar.html
Unfortunately, understanding that specific ...
- 125
4
votes
0
answers
109
views
Inherit docstrings from specified parent
I was recently working on some python where I was working with multiple inheritance and mixins and stuff like that, and I wanted to inherit docstrings for specific functions, from specific parents (...
- 61
7
votes
2
answers
165
views
Python class compressor
After watching this presentation, I decided that it would be a good project for me to undergo to practice my python skills. A summary of the presentation:
Jack ...
- 10.7k
4
votes
1
answer
14k
views
Python decorator to support static properties
Classes in Python do not have native support for static properties. A meta-class can rather easily add this support as shown below. Are there any problems programmers might experience if they use this ...
- 918
3
votes
1
answer
1k
views
Python simple type checking decorator
I'd like to know your opinions on this minimal type-checking decorator (with @ annotations) to make type checking of a method while debugging like :
...
- 346
2
votes
1
answer
168
views
A simple decorator written as a class, which counts how many times a function has been called
Can I improve its typing? Is there any other improvement or pythonic change that you would do?
...
11
votes
3
answers
1k
views
Simple generic auto __repr__
Preface
At some point I was tired of writing & supporting __repr__ methods, so I've decided to write it once and reuse everywhere in my classes.
Since I'm ...
- 370
3
votes
0
answers
100
views
Metaclass to run a __first__ method for the first instantiation of a class
I had an idea for a __first__ special method for a class. It would be run after __new__ and before ...
- 420
4
votes
1
answer
73
views
Decorator to add key parameter support to an existing sort function
Preface
sorted built-in function has key keyword-only parameter. Most of the custom implementations like the following for ...
- 370
7
votes
1
answer
307
views
Using Python decorators to do Hoare Logic
I'm relatively new to Python from a strong Java background. I am trying to create a base class to do Hoare Logic. Function decorators seem to be the way to go with this. I've produced the following ...
- 171
3
votes
1
answer
699
views
Function overloading in Python
Motivation
As an exercise, I wanted to try implementing function overloading in Python 3, i.e. to implement a way of defining multiple functions with the same name and then calling the appropriate ...
- 391