Several modules of the standard library (at least `re` and `csv`) have `__version__` strings.

The string is the same for Python 2.7-3.6:

    >>> import re, csv; print(re.__version__, csv.__version__)
    2.2.1 1.0

while documentation indicates changes in the modules.

Semantic versioning (recommended by PEP 440) suggests that at least minor version should change in such case.

I suspect it to be a "code fossil" which may be removed according to PEP 396.