Prevent void-variable error in python-mode (bug#73773)

* lisp/progmodes/python.el: Define 'subword-mode' before its use
in 'python-mode-map' so invoking menu-bar-open in a python-mode
buffer does not cause a void-variable error when subword-mode is
not loaded, menu-bar-mode is disabled and debug-on-error is enabled.

1 files changed, 2 insertions, 0 deletions

diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index 812e28268c2..a75317b3b0e 100644
--- a/lisp/progmodes/python.el
+++ b/lisp/progmodes/python.el
@@ -361,6 +361,8 @@ To customize the Python interpreter for interactive use, modify
   ;; Utilities
   "<remap> <complete-symbol>" #'completion-at-point)
 
+(defvar subword-mode nil)
+
 (easy-menu-define python-menu python-mode-map
   "Menu used for ´python-mode'."
   '("Python"