Nox in docker example

example.py

import os

def Main():
    x = os.getpid()
    print(f"{x=}")

if __name__ == '__main__':
    Main()

noxfile.py

import nox

# https://nox.thea.codes/en/stable/usage.html#re-using-virtualenvs
# same as -r option
# nox.options.reuse_existing_virtualenvs = True

@nox.session(python=["3.8", "3.9"])
def lint(session):
    session.install("flake8")
    session.run("flake8", "example.py")

start.ps

# -r reuse environment, -R reuse environment and installed packages
docker run --rm -it -v ${PWD}:/src thekevjames/nox:latest nox -r -f src/noxfile.py