Update runtime files
diff --git a/runtime/syntax/python.vim b/runtime/syntax/python.vim
index e67bf58..ff58325 100644
--- a/runtime/syntax/python.vim
+++ b/runtime/syntax/python.vim
@@ -1,7 +1,7 @@
" Vim syntax file
" Language: Python
" Maintainer: Zvezdan Petkovic <zpetkovic@acm.org>
-" Last Change: 2022 Jun 28
+" Last Change: 2023 Feb 26
" Credits: Neil Schemenauer <nas@python.ca>
" Dmitry Vasiliev
"
@@ -35,12 +35,26 @@
"
" let python_highlight_all = 1
"
+" The use of Python 2 compatible syntax highlighting can be enforced.
+" The straddling code (Python 2 and 3 compatible), up to Python 3.5,
+" will be also supported.
+"
+" let python_use_python2_syntax = 1
+"
+" This option will exclude all modern Python 3.6 or higher features.
+"
" quit when a syntax file was already loaded.
if exists("b:current_syntax")
finish
endif
+" Use of Python 2 and 3.5 or lower requested.
+if exists("python_use_python2_syntax")
+ runtime! syntax/python2.vim
+ finish
+endif
+
" We need nocompatible mode in order to continue lines with backslashes.
" Original setting will be restored.
let s:cpo_save = &cpo
@@ -91,8 +105,8 @@
syn keyword pythonAsync async await
" Soft keywords
-" These keywords do not mean anything unless used in the right context
-" See https://docs.python.org/3/reference/lexical_analysis.html#soft-keywords
+" These keywords do not mean anything unless used in the right context.
+" See https://docs.python.org/3/reference/lexical_analysis.html#soft-keywords
" for more on this.
syn match pythonConditional "^\s*\zscase\%(\s\+.*:.*$\)\@="
syn match pythonConditional "^\s*\zsmatch\%(\s\+.*:\s*\%(#.*\)\=$\)\@="