Python and Neovim
Some Vim plugins require Python, and if you're using NeoVim, you'll need to do a bit of extra work to get them working. An error message like this, seen when Python is definitely installed on your machine, is a hint you're in this predicament:
$ vim
MatchTagAlways unavailable: requires python
Neovim needs its own Python support. Solve the problem with this library, specifically one of the following commands depending on your Python version:
$ pip2 install neovim
$ pip3 install neovim
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