Setup.py allowing for reading version string from an environment variable

setup.py

import setuptools
from packaging.version import Version

with open("README.md", "r") as fh:
    long_description = fh.read()

with open("requirements.txt") as f:
    required = f.read().splitlines()

# Try to read version string from env variable
# Default to 0.0.0.dev0 to allow for installs through `pip install -e .`
version_string = os.environ.get("RELEASE_VERSION", "0.0.0.dev0")
version = Version(version_string)

setuptools.setup(
    name="package-name",
    version=str(version),
    description="Short description",
    long_description=long_description,
    long_description_content_type="text/markdown",
    install_requires=required,
)