patch 8.0.0251: not easy to select Python 2 or 3
Problem: It is not so easy to write a script that works with both Python 2
and Python 3, even when the Python code works with both.
Solution: Add 'pyxversion', :pyx, etc. (Marc Weber, Ken Takata)
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index cff41cf..bfb4c88 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -288,6 +288,11 @@
# define ex_py3do ex_ni
# define ex_py3file ex_ni
#endif
+#if !defined(FEAT_PYTHON) && !defined(FEAT_PYTHON3)
+# define ex_pyx ex_script_ni
+# define ex_pyxdo ex_ni
+# define ex_pyxfile ex_ni
+#endif
#ifndef FEAT_TCL
# define ex_tcl ex_script_ni
# define ex_tcldo ex_ni