make pending-delete/delete-selection mode work with py-electric-colon

Misc/python-mode.el

@@ -1194,7 +1194,7 @@ In certain cases the line is dedented appropriately.  If a numeric
 argument ARG is provided, that many colons are inserted
 non-electrically.  Electric behavior is inhibited inside a string or
 comment."
-  (interactive "P")
+  (interactive "*P")
   (self-insert-command (prefix-numeric-value arg))
   ;; are we in a string or comment?
   (if (save-excursion
@@ -1947,6 +1947,8 @@ number of characters to delete (default is 1)."
     (py-electric-backspace arg)))
 
 ;; required for pending-del and delsel modes
+(put 'py-electric-colon 'delete-selection t) ;delsel
+(put 'py-electric-colon 'pending-delete   t) ;pending-del
 (put 'py-electric-backspace 'delete-selection 'supersede) ;delsel
 (put 'py-electric-backspace 'pending-delete   'supersede) ;pending-del
 (put 'py-electric-delete    'delete-selection 'supersede) ;delsel