[Distutils] DRAFT PEP 396 - module version number

[Barry Warsaw]

Given Ben's and Fred's feedback, what do you think about this list in the
Specification's section:

#. In general, modules in the standard library SHOULD NOT have version
   numbers.  They implicitly carry the version number of the Python
   release they are included in.

#. On a case-by-case basis, standard library modules which are also
   released in standalone form for other Python versions MAY include a
   module version number when included in the standard library, and
   SHOULD include a version number when packaged separately.

#. When a module (or package) includes a version number, the version
   SHOULD be available in the ``__version__`` attribute.

#. For modules which live inside a namespace package, the sub-package
   name SHOULD include the ``__version__`` attribute.  The namespace
   module itself SHOULD NOT include its own ``__version__`` attribute.

#. The ``__version__`` attribute's value SHOULD be a string.

#. Module version numbers SHOULD conform to the normalized version
   format specified in PEP 386 [6]_.

#. Module version numbers SHOULD NOT contain version control system
   supplied revision numbers, or any other semantically different
   version numbers (e.g. underlying library version number).

#. The ``version`` attribute in a classic distutils ``setup.py``
   file, or the PEP 345 [7]_ ``Version`` metadata field SHOULD be
   derived from the ``__version__`` field, or vice versa.

-Barry
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