Python syntax highlighting for Vim

This is an enhanced version of the original Vim 6.1 Python syntax highlighting python.vim by Neil Schemenauer.

Features

Enhanced highlighting for:
- Strings
- Special symbols inside strings
- Numeric constants
Added support for:
- Python 3
- Numbers with underscores
- String %-formatting and f-strings
- Magic comments: source code encoding and shebangs
- New exceptions and builtins
- Doctests
- @decorator syntax
- Class variables such as self and cls
- Operators
Highlighting of the following errors:
- Invalid symbols in source file
- Invalid numeric constants
- Invalid %-formatting inside strings
- Invalid variable names
- Invalid operators
- Mixing spaces and tabs
- Trailing spaces (Enabled with g:python_highlight_space_errors)
Commands for easy switching between versions

Folding is done by the plugin SimpylFold.

Use one of the following plugin managers:

Set variable to 1 to enable or 0 to disable.

For example to enable all syntax highlighting features you can add the following command to your ~/.config/nvim/init.vim or ~/.vimrc:

let g:python_highlight_all = 1

Variable	Description	Default
`g:python_version_2`	Python 2 mode	`0`
`b:python_version_2`	Python 2 mode (buffer local)	`0`
`g:python_highlight_builtins`	Highlight builtin objects, types, and functions	`0`
`g:python_highlight_builtin_objs`	Highlight builtin objects only	`0`
`g:python_highlight_builtin_types`	Highlight builtin types only	`0`
`g:python_highlight_builtin_funcs`	Highlight builtin functions only	`0`
`g:python_highlight_builtin_funcs_kwarg`	Highlight builtin functions when used as kwarg	`1`
`g:python_highlight_exceptions`	Highlight standard exceptions	`0`
`g:python_highlight_string_formatting`	Highlight `%` string formatting	`0`
`g:python_highlight_string_format`	Highlight syntax of `str.format` syntax	`0`
`g:python_highlight_string_templates`	Highlight syntax of `string.Template`	`0`
`g:python_highlight_indent_errors`	Highlight indentation errors	`0`
`g:python_highlight_space_errors`	Highlight trailing spaces	`0`
`g:python_highlight_doctests`	Highlight doc-tests	`0`
`g:python_highlight_func_calls`	Highlight functions calls	`0`
`g:python_highlight_class_vars`	Highlight class variables `self` and `cls`	`0`
`g:python_highlight_operators`	Highlight all operators	`0`
`g:python_highlight_all`	Enable all highlight options above, except for previously set.	`0`
`g:python_highlight_file_headers_as_comments`	Highlight shebang and coding headers as comments	`0`
`g:python_slow_sync`	Disable for slow machines	`1`

Command	Description
`Python2Syntax`	Switch to Python 2
`Python3Syntax`	Switch to Python 3