Either don't use six or support an older version (like 1.4)

[d0ugal]

This is causing quite a few users problems, particularly on OSX.

See #576, #590 and a mailing list post. There are possible workarounds for this in the issues and email thread.

[samhatfield]

For what it's worth, I'm working on Linux Mint and I also had some issues. My system was using the six stored in /usr/lib/python2.7/dist-packages, which was about 1.5, even if a newer one was installed to /usr/local/lib/python2.7/dist-packages via pip. Eventually I had to rename the six files in the first directory to force it to use pip's version.

[d0ugal]

@samhatfield Thanks, we are trying to resolve this ASAP in #585. I'll probably roll a new release shortly after as this is causing issues for lots of people. I had no idea six was treated specially by different OSes.

[d0ugal]

This is now fixed in master, I'll be working on releasing very soon.