Martin v. Löwis wrote:
Eric Nieuwland wrote:
Would it be an idea to submit a PEP for extending the 'import' keyword?

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[1] as spamnext              # next version
import spam[0]  as spamnow              # current version

assert spamnow.Ni() == spamnext.Ni()

--eric

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