[Python-Dev] PEP 396, Module Version Numbers

[Barry Warsaw]

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On Apr 06, 2011, at 11:04 AM, John Arbash Meinel wrote:

>> In other words, parse_version will return a tuple for each version string,
>> that is compatible with StrictVersion but also accept arbitrary version and
>> deal with them so they can be compared:
>> 
>>>>> from pkg_resources import parse_version as V
>>>>> V('1.2')
>> ('00000001', '00000002', '*final')
>>>>> V('1.2b2')
>> ('00000001', '00000002', '*b', '00000002', '*final')
>>>>> V('FunkyVersion')
>> ('*funkyversion', '*final')
>
>bzrlib has certainly used 'version_info' as a tuple indication such as:
>
>version_info = (2, 4, 0, 'dev', 2)
>
>and
>
>version_info = (2, 4, 0, 'beta', 1)
>
>and
>
>version_info = (2, 3, 1, 'final', 0)
>
>etc.
>
>This is mapping what we could sort out from Python's "sys.version_info".

It's probably worth specifying the __version_info__ tuple in more detail in
either PEP 386 or 396.  I think more detail should go *somewhere*, and it
feels like it could go in either PEP.  Maybe Tarek can chime in on that.

>The *really* nice bit is that you can do:
>
>if sys.version_info >= (2, 6):
>  # do stuff for python 2.6(.0) and beyond
>
>Doing that as:
>
>if sys.version_info >= ('000000002', '000000006'):
>
>is pretty ugly.

I personally often do tests against sys.hexversion, which is a little less
ugly (maybe ;).

if sys.hexversion >= 0x20600f0:
    # 2.6 or 2.7

- -Barry
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