Drop support for Python 2.5 about urllib3 HOT 11 CLOSED

You know I'm reluctant but it I agree we'll have to do this eventually.

Seems every major third-party Python package I check still supports Py25: Django, httplib2, SQLAlchemy, etc.

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It would also make Python 3 compatibility (#16) easier. It's not impossible to support older versions, but the code is cleaner if you can assume 2.6+.

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@takluyver If you're willing to start work on Py3 compat, I'm willing to drop Py25 support. :-)

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@shazow 🍰

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Requests plans to drop 2.5 when the switch to 3 occurs as well (unless it's not a burden, of course)

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I'll hopefully have time to look into it later.

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I'm struggling to get the test suite to run without eventlet (just on Python 2.7). The dummyserver has a fallback to wsgiref's simple server (and I've done a bit of work to get that starting and stopping), but there are several test failures. Any ideas?

Current state is at: https://github.com/takluyver/urllib3/tree/py3

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I've persuaded it to work with Tornado as the server for the tests (Tornado is compatible with Python 3).

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@takluyver Thank you for your efforts so far! You're right that dummyserver is a bit fragile and not all the tests pass with wsgiref, specifically the ones that test SSL certs (since wsgiref doesn't support that). Perhaps we should remove wsgiref fallback altogether.

I'm happy to accept a port of dummyserver to Tornado. I'm not very strict about adding dependencies to the test suite, and eventlet is rather hacky on many platforms so this would be a good tradeoff.

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See PR #35

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Done since merging python3 into master.

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