I have:

# setup.py
from pkg_resources import parse_requirements
from setuptools import setup, find_packages

reqs = [
    "sanic",
    "sanic-ext",
    "xxxssdadasjdnaskjdnaksd"
]

setup(
    name='myutil',
    description='',
    packages=find_packages(),
    install_reqs=reqs  # open('requirements.txt').read().strip().split()
)

And I run

$ pip install -e .
Obtaining file:///home/sir/software/fingerWriterAI/sanic_util
  Preparing metadata (setup.py) ... done
Installing collected packages: sanic-util
  Attempting uninstall: sanic-util
    Found existing installation: sanic-util 0.0.0
    Uninstalling sanic-util-0.0.0:
      Successfully uninstalled sanic-util-0.0.0
  Running setup.py develop for sanic-util
Successfully installed sanic-util-0.0.0

[notice] A new release of pip available: 22.3 -> 24.0
[notice] To update, run: pip install --upgrade pip

It tries to install two packages but does not fail on the 3rd.
Why doesn’t this fail?