What's the idiomatic way of overriding a key binding for a given major-mode (but no other)?

Question

I'd like to bind C-x C-e to python-shell-send-region when I am in python major-mode.

In my config file, I have an add-hook for python mode, but I'd like this keybinding override to be removed/restored when I exit python major-mode.

The use-case for this is that I want to be able to switch my *scratch* buffer between modes and for things to continue making sense.

Is there an idiomatic way to achieve this?

Answer 1

Not too sure what you're asking. But it sounds like the answer is to bind your key in the major mode's keymap, not in the global-map.

For example, if the keymap for your Python mode is python-mode-map then do this:

(define-key python-mode-map (kbd "C-x C-e") 'python-shell-send-region)