Python

Topics

Python pip → python package manager
Python venv → python virtual environments
pyproject.toml → instead of requirements.txt or setup.py
MyPy (TODO) → a type checker for python
Python ruff → https://docs.astral.sh/ruff/ a fast python linter and code formatter
Python Conda

Simple '__main__' usage

if __name__=='__main__':
	print("hello world")

With main function, runnable as program:

import sys
 
def main() -> int:
	a=2+2
	print(f"2+2={a}")
 
if __name__=='__main__':
	sys.exit(main())

Context:

from myfolder.myClass import myClass

Error: ModuleNotFoundError: No module named 'myFolder'

Assuming you are using something like pyproject.toml, you can fix this by doing, from the home directory:

pip install -e .
python -m scripts.my_script.py

This ensures that Python set the home in the home of the project, and so

I installed this manager from https://www.python.org/downloads/release/pymanager-262/ due to a compatibility issue between (AWS) ParallelCluster’s internal asyncio usage and the newer Python versions.

To launch a different version of python you can run:

py -3.11

and you can also create a virtual environment i.e.

py -3.12 -m venv my-venv