Switch to Python 3

[serverwentdown]

This PR switches everything to the Python 3 syntax.

[serverwentdown]

The protocol should be backward compatible with Python 2 versions of CoVim. Haven't tested.

[FredKSchott]

Is anyone willing to test this with python 2? It would be good to know for sure before merging.

[narfman0]

There are so many py3 specific references, this can't possibly work without py3 (e.g. invoking vimscript py3 calls system python3 only, correct?)... that said, I don't know of a modern distro without py3 installed where people would be wanting to share terminal/vim sessions :)

[serverwentdown]

That was the major reason behind completely dropping Python 2 support. Ubuntu/Debian repositories default to a version of Vim without Python 2 compiled.

But then again, if someone can come up with a minimal backwards-compatible way to do this, that'd be great.

[narfman0]

My debian jessie vim-tiny has neither python nor python3 support. The next (very anecdotally) most common vim package, vim-nox, supports only python 2. The others have many gui library dependencies (gnome, gtk, athena). Which version of debian did you test with?

I believe this would break a typical debian jessie install :(. It looks like a lot of this can be conditional though, adding flexible support for either in vim.command(...) or in a conditional in the .vim script.

[narfman0]

This may fix more users than it breaks, so maybe merge and add support later. Just figured I'd bring it up :)

[serverwentdown]

@narfman0 Whoops, I meant Ubuntu's vim-nox package compiles only Python 3 support. Ubuntu (and Debian repositories don't have both compiled in at the same time, so using Python 3-only bundles would require breaking CoVim.

[mcepl]

I don't know of a modern distro without py3

Not everybody has a "modern" distro. RHEL-7/Debian-stable … specifically distros used by people who need computer for their work. I think better way is to use do dual-mode code, which works both with py2k and py3k.

[theSage21]

Any chance of this being merged or do I continue using the non-standard branch?