[Python-Dev] Re: [Pythonmac-SIG] The versioning question...
eric.nieuwland at xs4all.nl
Tue Dec 28 09:22:08 CET 2004
Martin v. Löwis wrote:
> Eric Nieuwland wrote:
>> Would it be an idea to submit a PEP for extending the 'import'
> No. Normally, packages should aim for backwards compatibility, so that
> applications would only want to specify a minimum version, such as
> import xml
> assert xml.version_info > (0,8,2)
> If you really want side-by-side installation of different versions,
> and a mechanism to select between them, the package could support
> import xml_0_8_2 as xml
> IOW, "import-as" should be sufficient for what you want to achieve.
Unless you are doing comparison tests, where it would be nice to be
able to state in a generic way that the new implementation should not
change answers. May be something like:
import spam as spamnext # next version
import spam as spamnow # current version
assert spamnow.Ni() == spamnext.Ni()
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