2

In Python3, file is no longer a builtin. It's just a plain ol' name that isn't even associated with anything until you do. But all the syntax files that I've used have it as a builtin.

Is there a simple way (I checked :help syn to look for an antonym, but nothing jumped out at me) to remove file from the syntax category, or do I pretty much just have to define my own?

2

You'll have to look at the syntax file and undo what it's doing. You can find the syntax file with :e $VIMRUNTIME/syntax/python.vim, and with /file I found:

" Python 2 only
syn keyword pythonBuiltin     basestring cmp execfile file
syn keyword pythonBuiltin     long raw_input reduce reload unichr
syn keyword pythonBuiltin     unicode xrange

[..]

" non-essential built-in functions; Python 2 only
syn keyword pythonBuiltin     apply buffer coerce intern

As far as I know there is no way to remove keywords from the syn keyword declaration, so you'll have to either:

  1. Clear the pythonBuiltin declarations with :syn clear pythonBuiltin and define your own with just the Python 3 ones: syn keyword pythonBuiltin abs all any [...]
  2. Override the Python 3 ones; e.g. :syn keyword pythonTwoBuiltin file.

The first method is arguably a bit "cleaner", but with the second method you will retain future additions to pythonBuiltin from the system's file. It will also allow you to do something like :hi link pythonTwoBuiltin pythonBuiltin to highlight the Python 2 builtins in case you find yourself editing Python 2 code.

I would personally opt for the second method, and added this to my vimrc:

" Remove Python 2 keywords.
augroup angering_zed_shaw
    autocmd!
    autocmd Syntax python
        \ syn keyword pythonTwoBuiltin basestring cmp execfile file long
        \                              raw_input reduce reload unichr unicode
        \                              xrange apply buffer coerce intern
augroup end

Note you can't just add this to your vimrc file; you'll have to use an autocmd or the ~/.vim/after/syntax/python.vim file. See How can I add additional syntax highlighting rules in my local vimrc? for details on that.

  • I wish I could +2 for angering_zed_shaw :D – Wayne Werner Jun 27 '17 at 13:27

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