[Tutor] Checking for Python version

[Steve Willoughby]

On Tue, Oct 06, 2009 at 09:47:43AM -0500, Wayne wrote:
> On Tue, Oct 6, 2009 at 9:46 AM, Steve Willoughby <steve at alchemy.com> wrote:
> 
> > On Tue, Oct 06, 2009 at 09:42:04AM -0500, Wayne wrote:
> > > On Tue, Oct 6, 2009 at 9:26 AM, Christian Witts <cwitts at compuscan.co.za
> > >wrote:
> > > if sys.version < '2.4':
> > >    sys.exit("Need at least Python 2.4")
> > >
> > > AFAIK the string comparison is reliable
> >
> > Not quite. What happens when you compare '2.4' and '2.10'?
> >
> 
> >>> '2.4' > '2.10'
> True

Exactly.  So it doesn't work.

In typical software release numbering, 2.10 is the tenth
minor version of the 2.x major version series, so 2.10 is
later than 2.4, but comparing as ASCII strings, it comes
out the other way around.

Also note that '10.1' < '5.7'

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Steve Willoughby    |  Using billion-dollar satellites
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