There is a canonical "version without patchlevel" provided by the 
sage_bootstrap library, nobody should re-implement "chopping off chars". 
E.g. (note the edge case): 

In [1]: import sys
In [2]: sys.path.append('build')
In [3]: from sage_bootstrap.package import Package
In [4]: Package('singular').version
Out[4]: '3.1.7p1'
In [5]: !cat build/pkgs/singular/package-version.txt
3.1.7p1.p0

Still, your own interface need not correspond to a particular Sage package 
(e.g. the M* interfaces). So version has to come from the interfaced 
program. 



On Sunday, September 6, 2015 at 10:31:19 PM UTC+2, Nathann Cohen wrote:
>
> I don't think that package-version.txt should be used as answer to 
>> package.version() in Sage. I consider this file to be build metadata, 
>> while package.version() should provide upstream's idea of the version 
>> number, using some function or data from the upstream sources. 
>>
>
> Can't we expect that the content of package-version.txt is *precisely* 
> upstream's version, except for the ending .p0 or .p[number]? In which case 
> we only have to strip that.
>
> Nathann 
>

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