Automatic version number both in setup.py (setuptools) AND source code?

Question

SITUATION:

I have a python library, which is controlled by git, and bundled with distutils/setuptools. And I want to automatically generate version

Answer 1

Following OGHaza's solution in a similar SO question I keep a file _version.py that I parse in setup.py. With the version string from there, I git tag in setup.py. Then I set the setup version variable to a combination of version string plus the git commit hash. So here is the relevant part of setup.py:

from setuptools import setup, find_packages
from codecs import open
from os import path
import subprocess

here = path.abspath(path.dirname(__file__))

import re, os
VERSIONFILE=os.path.join(here,"_version.py")
verstrline = open(VERSIONFILE, "rt").read()
VSRE = r"^__version__ = ['\"]([^'\"]*)['\"]"
mo = re.search(VSRE, verstrline, re.M)
if mo:
    verstr = mo.group(1)
else:
    raise RuntimeError("Unable to find version string in %s." % (VERSIONFILE,))
if os.path.exists(os.path.join(here, '.git')):
    cmd = 'git rev-parse --verify --short HEAD'
    git_hash = subprocess.check_output(cmd)
    # tag git
    gitverstr = 'v' + verstr
    tags =  subprocess.check_output('git tag')
    if not gitverstr in tags:
        cmd = 'git tag -a %s %s -m "tagged by setup.py to %s"' % (gitverstr, git_hash, verstr)        
        subprocess.check_output(cmd)
    # use the git hash in the setup
    verstr += ', git hash: %s' % git_hash

setup(
    name='a_package',
    version = verstr,
    ....