Bug#523998: python-apt: Package class should have a get_version method

[Julian Andres Klode <jak@debian.org>]

On Tue, Apr 14, 2009 at 09:22:26AM +0200, Sebastian Heinlein wrote:
> Package: python-apt
> Version: 0.7.7.1+nmu1
> Severity: wishlist
> Tags: patch
> 
> The Package class should provide a nice way to get a corresponding Version 
> instance by specifing the version string.
> 
> E.g.: Package.get_version("242-1")

We could also support Package.versions["242-1"], by providing a class VersionList
with a special __getitem__()

The code listed below would allow us to do things like::

    '242-1' in Package.versions
    Package.versions['242-1']

While still allowing stuff like::

    Package.versions[0]

This gives us a bit more options, and seems a bit more natural; although we would
have a class which represents a sequence and parts of a mapping.

Else we may get a request: please add has_version() to Package or similar.

What do you think?


-- (Pseudo?) Code:

class VersionList(list):

    def __getitem__(self, item):
        if not isinstance(item, basestr):
            return list.__getitem__(self, item)
        for ver in self:
            if ver.version == item:
                return ver

    def __contains__(self, item):
	for ver in self:
		if ver.version == item or ver == item:
			return True



-- 
Julian Andres Klode  - Free Software Developer
   Debian Developer  - Contributing Member of SPI
   Ubuntu Member     - Fellow of FSFE

Website: http://jak-linux.org/   XMPP: juliank@jabber.org
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