Support body.keys() when it returns an iterable instead of a list (Python 3). Fixes #476.

[jaraco]

I believe this approach is sound. It will raise a StopIteration instead of a KeyError if keys() is empty, but I suspect the actual exception in that case is not important. If it's important to keep that behavior, an alternative approach would be to cast the result of keys() to a list before dereferencing the first element.

[sivel]

Currently Python 3 is not supported by pyrax. While this is important and a goal for the project, python 3 compatibility will need to be solved at a larger scale. At the moment there are 711 errors and 7 failures running the unit tests against python 3.4 which amounts to about 57% test failure.

The current version of python supported with pyrax is python 2.7.

For the time being I am going to close this issue.

[jaraco]

Oh?! :(

I'm not sure I understand. I've already submitted some broad patches to support Python 3. Thanks in part to those fixes, I was able to use import_domain under Python 3.

This fix addresses a specific bug which I tracked to its source, documented with a ticket, and fixed in a surgical, compatible way.

I've followed the style guidelines. I've committed to the proper branch. The tests all pass. I've made this PR imminently pullable.

I understand that Python 3 is not supported. How do you intend to support it without fixing the issues? What would it take to accept this PR?

[jaraco]

In #481, you mentioned a desire to be strict on exceptions. I'll update the PR to take that approach.

[jaraco]

It seems I'm unable to amend the pull request now that it's closed.