Leif Walsh wrote:
> On Feb 2, 2008 8:38 PM, Ron Adam <[EMAIL PROTECTED]> wrote:
>
>> Instead of a shebang which depends on the shell, maybe a version specifier
>> of some sort could be used?
>>
>> # -*- pyversions: 2.5, 2.6 -*-
>>
>> So if a python 3.x detects a too low a version, maybe it can try to restart
>> the program with the highest installed version specified. (Or some
>> variation of this.)
>>
>
> There is already an idiom with other packages (pygtk etc.) that
> suggests syntax like
>
> try:
> python.require('3.1')
> except:
> print('Some warning about version incompatibility')
> exit(1)
>
> This concern seems better addressed within the language itself, rather
> than in the shebang (which would make the decision depend on the shell
> and the packaging involved).
>
>
Great idea. Since we've already got everything we need in version_info,
this would be trivial and could address most of the issues raised ...
something like this?
>>> def checkversion(maj, min, rel):
... version = sys.version_info
... if version[0] < maj or version[1] < min or version[2] < rel:
... raise Exception('Version %d.%d.%d of Python is required
for this program' % (maj, min, rel))
...
>>> checkversion(2, 5, 0)
>>> checkversion(3, 0, 0)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 4, in checkversion
Exception: Version 3.0.0 of Python is required for this program
>>>
Cheers,
T
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