Don't override python font locking in comint

* lisp/comint.el (comint-highlight-input): New variable (bug#32344).
(comint-send-input): Use it.

* lisp/progmodes/python.el (inferior-python-mode): Set it.

lisp/comint.el

@@ -223,6 +223,12 @@ This variable is buffer-local."
 		 (other :tag "on" t))
   :group 'comint)
 
+(defcustom comint-highlight-input t
+  "If non-nil, highlight input with `comint-highlight-input' face.
+Otherwise keep the original highlighting untouched."
+  :type 'boolean
+  :group 'comint)
+
 (defface comint-highlight-input '((t (:weight bold)))
   "Face to use to highlight user input."
   :group 'comint)
@@ -1897,9 +1903,10 @@ Similarly for Soar, Scheme, etc."
               (end (if no-newline (point) (1- (point)))))
           (with-silent-modifications
             (when (> end beg)
-              (add-text-properties beg end
-                                   '(front-sticky t
-                                     font-lock-face comint-highlight-input))
+              (when comint-highlight-input
+               (add-text-properties beg end
+                                    '(front-sticky t
+                                      font-lock-face comint-highlight-input)))
               (unless comint-use-prompt-regexp
                 ;; Give old user input a field property of `input', to
                 ;; distinguish it from both process output and unsent

lisp/progmodes/python.el

@@ -2791,6 +2791,7 @@ variable.
          python-shell-comint-watch-for-first-prompt-output-filter
          python-comint-postoutput-scroll-to-bottom
          comint-watch-for-password-prompt))
+  (setq-local comint-highlight-input nil)
   (set (make-local-variable 'compilation-error-regexp-alist)
        python-shell-compilation-regexp-alist)
   (add-hook 'completion-at-point-functions