From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Charles C. Berry" <ccberry@ucsd.edu>
Subject: Re: babel header arguments tutorial?
Date: Sat, 26 Sep 2015 14:39:25 -0700
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To: Lawrence Bottorff <borgauf@gmail.com>
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On Sat, 26 Sep 2015, Lawrence Bottorff wrote:

> I see this <http://orgmode.org/worg/org-contrib/babel/header-args.html> and
> find the bottom section ("Setting language and file specific default header
> argument value") intriguing, however too cryptic. Can someone explain
> what's going on here and how to use it?


I'd say "don't use it". The source is several years old and filed under 
the FIXME worg directory.

header-arg handling has improved lately.

See (info "(org) Header arguments in Org mode properties") for a good 
appproach that uses this one line

 	#+PROPERTY: header-args:python  :session foo

to do what is in the example you cite.

HTH,

Chuck