Changing the default syntax highlighting
From Vim Tips Wiki
Vim provides syntax files that can provide syntax coloring or folding for certain types of files. This tip discusses how to change some features of the standard syntax files to suit a personal preference. Do not change any of the files distributed with Vim because such updates will be lost when Vim is updated. Instead, use the techniques discussed here.
Here are some pointers to the Vim documentation on syntax highlighting.
- I want
*.foofiles to be highlighted like HTML files: :help new-filetype
- I want to define a syntax file for
*.barfiles. Read the above and also: :help mysyntaxfile
- I want to make a few changes to the existing syntax highlighting: :help mysyntaxfile-add
- I want to change some of the colors from their defaults. Again, read :help mysyntaxfile
 Python triple-quoted comments
In Vim 7.3 the file
vim73/syntax/python.vim provides syntax highlighting for Python files. That file (correctly) treats
"""...""" as a string and highlights it accordingly. If you prefer, instances of
'''...''' that start on the line following a line ending with a colon can be treated as a comment. To do that, create file
python.vim in your "after" syntax directory as in the following. The next Python file you open should treat triple-quoted doc strings in functions as comments (assuming your vimrc includes commands like
filetype indent plugin on and
Add the following to file
~/.vim/after/syntax/python.vim (Unix) or
$HOME/vimfiles/after/syntax/python.vim (Windows)—you may need to create the directories and the file.
syn region pythonComment \ start=+\%(:\n\s*\)\@<=\z('''\|"""\)+ end=+\z1+ keepend \ contains=pythonEscape,pythonTodo,@Spell
This tip is vaguely related:
 Changing syncolor.vim
It is possible to replace Vim's syncolor.vim file to customise syntax highlighting. :help syncolor See Highlight special filetype docs which includes a comment that a syncolor.vim alternative is available here. --March 9, 2013