Recommended way to run my scripts from a venv? (feddit.org)

submitted 4 months ago by Schmerzbold@feddit.org to c/python@programming.dev

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So, I have a python script I'd like to run from time to time from the CLI (on Linux) that resides inside a venv. What's the recommended/intended way to do this?
Write a wrapper shell script and put it inside a $PATH-accessible directory that activates the virtual environment, runs the python script and deactivates the venv again? This seems a bit convoluted, but I can't think of a better way.

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[-] logging_strict@programming.dev 1 points 4 months ago

The multiple venv for different Python versions sounds exactly like what tox does

Then setup a github action that does nightly builds. Which will catch issues caused by changes that only tested against one python version or on one platform

py313 is a good version to test against cuz there were many modules removed or depreciated or APIs changed

good luck. Hope some of my advice is helpful

[-] Andy@programming.dev 2 points 4 months ago

Thanks, yes, I use nox and github actions for automated environments and testing in my own projects, and tox instead of nox when it's someone else's project. But for ad hoc, local and interactive multiple environments, I don't.

[-] logging_strict@programming.dev 1 points 2 days ago

thanks for the head up on nox. Syntax seems like a tox meets pytest.

[-] logging_strict@programming.dev 1 points 2 days ago

Are you using github actions locally? Feel silly making gh actions and workflows and only github runs them

[-] Andy@programming.dev 1 points 2 days ago

No, I don't use GHA locally, but the actions are defined to run the same things that I do run locally (e.g. invoke nox). I try to keep the GHA-exclusive boilerplate to a minimum. Steps can be like:

- name: fetch code
  uses: actions/checkout@v4

- uses: actions/setup-python@v5
  with:
    allow-prereleases: true
    python-version: |
      3.13
      3.12
      3.11
      3.10
      3.9
      3.8
      3.7

- run: pipx install nox

- name: run ward tests in nox environment
  run: nox -s test test_without_toml combine_coverage --force-color
  env:
    PYTHONIOENCODING: utf-8

- name: upload coverage data
  uses: codecov/codecov-action@v4
  with:
    files: ./coverage.json
    token: ${{ secrets.CODECOV_TOKEN }}

Sometimes if I want a higher level interface to tasks that run nox or other things locally, I use taskipy to define them in my pyproject.toml, like:

[tool.taskipy.tasks]
fmt = "nox -s fmt"
lock = "nox -s lock"
test = "nox -s test test_without_toml typecheck -p 3.12"
docs = "nox -s render_readme render_api_docs"

[-] logging_strict@programming.dev 1 points 11 hours ago

Thanks for the introduction to taskipy. Think if i need macros, Makefile is the way to go. Supports running targets in parallel and i like performing a check to ensure the virtual environment is activated or the command won't run.

.ONESHELL:
.DEFAULT_GOAL := help
SHELL := /bin/bash
APP_NAME := logging_strict

#virtual environment. If 0 issue warning
#Not activated:0
#activated: 1
ifeq ($(VIRTUAL_ENV),)
$(warning virtualenv not activated)
is_venv =
else
is_venv = 1
VENV_BIN := $(VIRTUAL_ENV)/bin
VENV_BIN_PYTHON := python3
PY_X_Y := $(shell $(VENV_BIN_PYTHON) -c 'import platform; t_ver = platform.python_version_tuple(); print(".".join(t_ver[:2]));')
endif

.PHONY: mypy
mypy:					## Static type checker (in strict mode)
ifeq ($(is_venv),1)
	@$(VENV_BIN_PYTHON) -m mypy -p $(APP_NAME)
endif

make mypy without the virtualenv on will write a warning message why it's not working!

[-] Andy@programming.dev 1 points 8 hours ago* (last edited 8 hours ago)

Sure, but nox is the closer counterpart for in-venv-task definitions. List "sessions" with -l, pick specific sessions to run with -s.

import nox
from nox.sessions import Session

nox.options.reuse_existing_virtualenvs = True
APP_NAME = 'logging_strict'

@nox.session(python='3.12')
def mypy(session: Session):
    """Static type checker (in strict mode)"""
    session.install('-U', 'mypy', '.')
    session.run('mypy',  '-p', APP_NAME, *session.posargs)

Unfortunately it doesn't currently do any parallel runs, but if anyone wants to track/encourage/contribute in that regard, see nox#544.