Use zipfile.ZipFile.open instead of twisted.python.zipstream in twisted.python.zippath

[exarkun]

Python 2.6 introduces an open method on which provides file-like access to a file inside a zipfile. This provides the streaming access necessary to implement twisted.python.zippath.ZipPath.open.

On older versions of Python, we'll still have to use twisted.python.zipstream, of course.

[glyph]

I don't think there's really much value in doing this; as far as I know, our implementations of this functionality are largely equivalent. It would be nice to get rid of zipstream eventually, of course, but it's going to be years before we can drop 2.5.

[exarkun]

The main value in doing this now is probably to determine if the thing in the standard library actually works. If we report bugs against it now, they might actually be fixed in a released version of Python by the time we could drop our own implementation.

[exarkun]

I've done this in  lp:filepath now. It was actually a very simple change, just a couple lines, and the unit tests all still pass.

See  http://bazaar.launchpad.net/~exarkun/filepath/trunk/revision/11#filepath/_zippath.py

(Note that this is without the fallback for older Pythons)

[aruse]

This appears to be a duplicate of #4035, where I just submitted a patch.