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When using org mode, how can I map a specific keybinding (ex. C-c s) to create an org code snippet that looks like this:

#+BEGIN_SRC python

#+END_SRC
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You can always write a function that inserts a string and then bind it to a key:

(defun insert-python-src-block ()
   (interactive)
   (insert "#+BEGIN_SRC python\n\n#+END_SRC"))

(define-key org-mode-map (kbd "C-c s") #'insert-python-src-block)

But key bindings are scarce commodities; they also tend to be hard to remember when they proliferate. So most people prefer a templating mechanism for this. Org mode provides one based on the variable org-structure-template-alists. You get extensibility, but you don't get to choose an arbitrary keybinding for it.

Here's how that works - you add this to your init file:

(with-eval-after-load 'org
   (add-to-list 'org-structure-template-alist '("p" . "src python")))

Then you invoke any of the templates with C-c C-, (bound to org-insert-structure-template) which gives you a menu of possibilities: choosing p inserts the new template you added.

For details, do C-h v org-structure-template-alist RET to read the doc string of the variable, do C-h f org-insert-structure-template to read the doc string of the function, and read the Structure templates section of the manual either online, or locally with C-h i g(org)Structure templates RET which also describes the backward-compatible org-tempo based method as well.

There are other templating mechanisms: yasnippets seems to be the most popular, but I don't know enough about it to describe it here.

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