From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nick Dokos <ndokos@gmail.com> Subject: Re: babel header arguments tutorial? Date: Sat, 26 Sep 2015 22:41:57 -0400 Message-ID: <87vbawziq2.fsf@pierrot.dokosmarshall.org> References: <CAFAhFSUZLQSGYG9du9gDv+F2en1UqUJ8nYm93zVT2FQh-HLJ1w@mail.gmail.com> <87zj08zvcl.fsf@pierrot.dokosmarshall.org> <m24migyf7e.fsf@tsdye.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: <emacs-orgmode-bounces+geo-emacs-orgmode=m.gmane.org@gnu.org> Received: from eggs.gnu.org ([2001:4830:134:3::10]:34067) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <geo-emacs-orgmode@m.gmane.org>) id 1Zg1uq-0008DC-5S for emacs-orgmode@gnu.org; Sat, 26 Sep 2015 22:42:17 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <geo-emacs-orgmode@m.gmane.org>) id 1Zg1um-0007yj-W1 for emacs-orgmode@gnu.org; Sat, 26 Sep 2015 22:42:16 -0400 Received: from plane.gmane.org ([80.91.229.3]:33419) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <geo-emacs-orgmode@m.gmane.org>) id 1Zg1um-0007yS-PH for emacs-orgmode@gnu.org; Sat, 26 Sep 2015 22:42:12 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from <geo-emacs-orgmode@m.gmane.org>) id 1Zg1ug-0001v1-EC for emacs-orgmode@gnu.org; Sun, 27 Sep 2015 04:42:06 +0200 Received: from pool-108-20-41-232.bstnma.fios.verizon.net ([108.20.41.232]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for <emacs-orgmode@gnu.org>; Sun, 27 Sep 2015 04:42:06 +0200 Received: from ndokos by pool-108-20-41-232.bstnma.fios.verizon.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for <emacs-orgmode@gnu.org>; Sun, 27 Sep 2015 04:42:06 +0200 List-Id: "General discussions about Org-mode." <emacs-orgmode.gnu.org> List-Unsubscribe: <https://lists.gnu.org/mailman/options/emacs-orgmode>, <mailto:emacs-orgmode-request@gnu.org?subject=unsubscribe> List-Archive: <http://lists.gnu.org/archive/html/emacs-orgmode> List-Post: <mailto:emacs-orgmode@gnu.org> List-Help: <mailto:emacs-orgmode-request@gnu.org?subject=help> List-Subscribe: <https://lists.gnu.org/mailman/listinfo/emacs-orgmode>, <mailto:emacs-orgmode-request@gnu.org?subject=subscribe> Errors-To: emacs-orgmode-bounces+geo-emacs-orgmode=m.gmane.org@gnu.org Sender: emacs-orgmode-bounces+geo-emacs-orgmode=m.gmane.org@gnu.org To: emacs-orgmode@gnu.org Thomas S. Dye <tsd@tsdye.com> writes: > Aloha Nick, > > Nick Dokos <ndokos@gmail.com> writes: > >> The implementation on the page you linked contains a typo (capital P >> instead of lower-case p in python) and is much more prolix than it needs >> to be. You can get the same effect with >> >> # Local Variables: >> # org-babel-default-header-args:python: ((:session . "foo"))) >> # End: >> >> This form should be preferred for just setting variables. The eval >> mechanism should be used only when absolutely necessary. > > Can you elaborate why the eval mechanism should be used only when > absolutely necessary? You've mentioned that a few times but I haven't > run across similar warnings elsewhere. > It's a matter of safety: eval allows you to evaluate arbitrary lisp code. Doing that in a local-variables block which is run when you open the file can lead to all kinds of damage. If you get a file with an eval in the local variables section, you'd better be very sure before opening the file in emacs. Here's one warning: http://www.gnu.org/software/emacs/manual/html_node/emacs/Safe-File-Variables.html -- Nick