Re: babel header arguments tutorial?

[Lawrence Bottorff <borgauf@gmail.com>]

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I guess from a purely elisp perspective I'm baffled. How is

#+begin_src emacs-lisp
  org-babel-default-header-args:Python
#+end_src

supposed to produce

#+RESULTS:
| (:session . foo) |

as it supposedly does in the doc? It doesn't for me. (Where, e.g., would
"foo" be coming from?) If it had worked, does it make an addition to some
hash table, or an alist somewhere? But then running this as an elisp code
block is cool from a declarative programming standpoint (see this
<https://github.com/tj64/org-dp>) . So this

# Local Variables:
# eval: (setq-local org-babel-default-header-args:Python '((:session .
"foo")))
# End:

is called when you eval-buffer or open the file?

Ancillary questions:
1. can babel elisp (or CL) blocks be assigned/associated to a specifically
named session? That would enable various elisp code blocks to have separate
"session spaces" (as does the geiser/scheme babel). If so, I'm guessing the
block-session communication could also be remote? Again, with babel
geiser/scheme sessions, can they call "cached" things from each other's
different sessions?

2. . . . which makes me wonder how code blocks in a buffer can be run
besides manually C-c C-c ing them. For example,


#+name: myexptdouble
#+begin_src emacs-lisp :session
(defun myexptdouble (x y)
  (* (myexpt x y) (myexpt x y)))
#+end_src

#+RESULTS: myexptdouble
: myexptdouble

#+name: myexpt
#+begin_src emacs-lisp :session
(defun myexpt (x y)
  (expt x y))
#+end_src

#+BEGIN_SRC emacs-lisp :results output raw
(myexptdouble 2 3)
#+END_SRC

Even if I manually evaluate myexptdouble, running the last block gives an
error about not knowing what myexpt is. Is there something in the last
block that can be told to evaluate all the dependent functions? Perhaps if
my blocks are named the same as the function name? How tangling and
preserving sessions is also an interesting question, IHMO.

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