   :group 'python)
 
 (defcustom pyd-python-command-args '("-u" "-i")
+  "*List of string arguments to be used when starting a Python shell."
+  :type '(repeat string)
+  :group 'python)
+
+(defcustom pyo-python-command-args '("-i" "-OO")
   "*List of string arguments to be used when starting a Python shell."
   :type '(repeat string)
   :group 'python)

  :type 'string
  :group 'python)

(defcustom py-jpython-command "jpython"
  "*Shell command used to start the JPython interpreter."
  :type 'string

      (setq py-which-shell py-jpython-command
	    ppy-which-shell ppy-jpython-command
	    pyd-which-shell pyd-python-command
	    pyo-which-shell pyo-python-command
	    py-which-args py-jpython-command-args
	    py-which-bufname "JPython"
	    msg "JPython"
