[Distutils] Single version number

[Marius Gedminas]

What do people use to avoid repeating the version number both in the
setup.py as well as in application/library code, when the
application/library wants to know its own version number?

I've seen several options:

  1) put __version__ = '4.2' in yourpackage/__init__.py, have setup.py
     do from yourpackage import __version__ and pass that to setup()

  2) put __version__ = '4.2' in yourpackage/__init__.py, have setup.py
     execfile(os.path.join(os.path.dirname(__file__), 'src', 'yourpackage',
                           '__init__.py'), d), then use d['__version__']

  3) put a file called version.txt in yourpackage/, have setup.py read
     it, make sure it's included in MANIFEST.in

  4) I don't recall actually ever seeing this one, but it should be
     possible to use pkg_resources to query the version of yourpackage
     (downside: if you're running from a source checkout without
     installing, you won't get the right version number)

Marius Gedminas
-- 
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