Shortcut for inserting environments in `org-mode`

Question

I'm using org-mode for organizing myself (very useful so far!). However, it is kind of annoying writting

  #+begin_comment
  ...
  #+end_comment

each time I'd like to insert an environment.

Question

Is there a shortcut to insert the #+begin_ and #+end_ for a given environment?

In the same way C-c C-o comment RET would insert

\begin{comment}

\end{comment}

in latex-mode.

Answer 1

Org has a facility called "Easy templates": http://orgmode.org/manual/Easy-Templates.html

A template for comment is missing but you can add it with:

(add-to-list 'org-structure-template-alist '("C" "#+begin_comment\n?\n#+end_comment"))

And use it by typing <C followed by TAB.

Alternatively, you could use yasnippet.

Answer 2

Now the corresponding template section is called Structure Template and the insertion sequence is invoked by C-c C-,. I didn't (require 'org-tempo) which is described to support insertion keys like <s TAB.

The comment environment is already defined in org-structure-template-alist. So the comment would be inserted by

C-c C-, C

It's still possible to add a user defined sequence by, for example,

C-c C-, [TAB|RET|SPC] src python :results output :session

delivering

#+begin_src python :results output :session
#+end_src

(emacs 25.2.2, org-mode 9.2)