[yt-dev] Managing dropping python2 support

[Nathan Goldbaum]

Hi all,

PyCon is going on right now in Portland. One of the talks today was about
how IPython managed dropping support for python2 in IPython 6.0. You can
watch the talk here:

https://youtu.be/2DkfPzWWC2Q

Some takeaways from me (all opinions my own):

IPython probably did this a bit too early. Since they're relying on
features in pip and setuptools that were only added a few months ago, users
are unlikely to have up-to-date versions that will behave nicely.

On the other hand, IPython is a big enough package that they are actually
driving people to update their pip installation after hitting some breakage.

We can do things now to minimize pain in the future if we do drop support
for some python versions we support right now:

* Define requires_python in our setup.py
* Update our documentation and scripts to use "pip install ." or "pip
install -e ." instead of "python setup.py install" or "develop"

Nathan
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