You can always define your own key bindings in Emacs. Type Ch m first to see the help in mode in the pdb buffer (which starts with Mx pdb ).
Then bind any key combination:
(require 'gud)
(define-key gud-mode-map '[f11]' gud-step)
(define-key gud-mode-map '[f10]' gud-next)
(define-key gud-mode-map '[f5]' gud-cont)
(define-key gud-mode-map '[f12]' gud-break)
Read the Emacs manual on the built-in interface for the debugger (type Ch i g (emacs) Debuggers RET ) or online:
http://www.gnu.org/software/emacs/manual/html_node/emacs/Debuggers.html
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