[docs] Cpython sys.version parser in platform.py bug and resolution?

[Zerbe, Brandon]

To whom this may concern;

I am contacting you in the hope that I may provide help to others by addressing a possible, very small bug (assuming I diagnosed and solved the issue correctly).  No need to contact me since I consider my solution as sufficient.

I ran into an exception today from a program running plaftorm.py using python version 2.7.5.  Here is the code in platform.py that produced the exception (line 1454)

match = _sys_version_parser.match(sys_version)
if match is None:
    raise ValueError(
        'failed to parse CPython sys.version: %s' %
        repr(sys_version))


This results from the following regular expression:

_sys_version_parser = re.compile(
    r'([\w.+]+)\s*'
    '\|[^|]*\|\s*' # version extra
    '\(#?([^,]+),\s*([\w ]+),\s*([\w :]+)\)\s*'
    '\[([^\]]+)\]?')

At least on my computer, CPython does not have "version extra".  So I simply removed the second part of the regular expression and put it into a new object:

_cpython_sys_version_parser = re.compile(
    r'([\w.+]+)\s*'
    '\(#?([^,]+),\s*([\w ]+),\s*([\w :]+)\)\s*'
    '\[([^\]]+)\]?')

I then called this object for cpython, and it appears to have worked (fingers crossed).

Thanks,

Brandon Zerbe
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