If I understand your proposal correctly, this is already possible, see https://www.python.org/dev/peps/pep-0397/#python-version-qualifiers
The details are likely a little different than what you're proposing, but if they don't cover what you're trying to do, maybe you could give a more specific example of a use case that isn't currently possible? Paul On 23 November 2017 at 08:43, Steve Barnes <[email protected]> wrote: > Following on from the discussions on pip I would like to suggest, (and > possibly implement), a minor change to the current py.exe python launcher. > > Currently the launcher, when called without a version specifier, > defaults to the highest version on the basis of 3>2, x.11 > x.9, -64 > > -32 however this may not always be the most desirable behaviour. > > I would like to suggest that it take a configuration value for the > default version to use, (and possibly a separate ones for pyw, & file > associations), honouring the following with the later overriding: > > default - as current > system setting - from registry > user setting - from registry > user setting - from config file maybe %appdata%\pylauncher\defaults.ini > environment setting - from getenv > local setting - from .pyconfig file in the current directory. > > Options would be the same format as the -X[.Y][-BB] format currently > accepted on the command line plus a --No-Py-Default option which would > always error out if the version to invoke was not specified. > > I see this as potentially adding quite a lot of value for people with > multiple python versions installed and it could tie in quite well with > the possible use of py.exe as an entry point for tools such as pip. > > It might also increase the awareness of the launcher as those who have > to stick with python 2 for the moment or in a specific context could set > the default to what they need but can always override. > > -- > Steve (Gadget) Barnes > Any opinions in this message are my personal opinions and do not reflect > those of my employer. > > --- > This email has been checked for viruses by AVG. > http://www.avg.com > > _______________________________________________ > Python-ideas mailing list > [email protected] > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ _______________________________________________ Python-ideas mailing list [email protected] https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
