Re: Extraneous output from Python code blocks using :session option

[Kyle Meyer <kyle@kyleam.com>]

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Richard Stanton <stanton@haas.berkeley.edu> wrote:
> I'm trying to use the :session option so I can import modules, etc.,
> just once at the beginning of my document, like with am IPython
> notebook. Unfortunately, the output from these code blocks contains
> some extraneous characters. For example:
>
> #+BEGIN_SRC python :session :results output
> a = 2
> b = 3
> c = 4
> print 'a=      ', a
> print 'b =     ', b
> print 'a + b = ', a+b
> #+END_SRC
>
> #+RESULTS:
> :
> : >>> >>> a=       2
> : b =      3
> : a + b =  5

I also see this behavior.  I asked the list some time ago [1], but I
didn't follow up beyond the initial email.

> How can I stop the production of all those ">" signs (sometimes
> they're dots), which don't appear if I run the same code block without
> the :session option?

I've attached a patch that seems to fix the example you gave and the
cases from my earlier email.  I don't know enough about babel's
internals to know if it is a good way to fix it, but at least it might
serve as a quick fix for you until there is a better solution.

[1] http://thread.gmane.org/gmane.emacs.orgmode/79014


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From cfa2783e03152871c0d703a6f79e96254dbe6c44 Mon Sep 17 00:00:00 2001
From: Kyle Meyer <kyle@kyleam.com>
Date: Wed, 11 Mar 2015 14:17:09 -0400
Subject: [PATCH] ob-python.el: Strip leading session characters

* lisp/ob-python.el (org-babel-python-evaluate-session): Strip leading
  "..." and ">>>" from session output.
(org-babel-python-strip-session-chars): New function.
---
 lisp/ob-python.el | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

diff --git a/lisp/ob-python.el b/lisp/ob-python.el
index dd3cc66..0267f22 100644
--- a/lisp/ob-python.el
+++ b/lisp/ob-python.el
@@ -306,16 +306,17 @@ (defun org-babel-python-evaluate-session
          (results
           (case result-type
             (output
-             (mapconcat
-              #'org-babel-trim
-              (butlast
-               (org-babel-comint-with-output
-                   (session org-babel-python-eoe-indicator t body)
-                 (funcall input-body body)
-                 (funcall send-wait) (funcall send-wait)
-                 (insert org-babel-python-eoe-indicator)
-                 (funcall send-wait))
-               2) "\n"))
+	     (org-babel-python-strip-session-chars
+	      (mapconcat
+	       #'org-babel-chomp
+	       (butlast
+		(org-babel-comint-with-output
+		    (session org-babel-python-eoe-indicator t body)
+		  (funcall input-body body)
+		  (funcall send-wait) (funcall send-wait)
+		  (insert org-babel-python-eoe-indicator)
+		  (funcall send-wait))
+		2) "\n")))
             (value
              (let ((tmp-file (org-babel-temp-file "python-")))
                (org-babel-comint-with-output
@@ -339,6 +340,15 @@ (defun org-babel-python-read-string (string)
       (match-string 1 string)
     string))
 
+(defun org-babel-python-strip-session-chars (string)
+  "Remove leading >>> and ... from Python session output."
+  (with-temp-buffer
+    (insert string)
+    (goto-char (point-min))
+    (when (looking-at "\\s-*\\(\\(>>> \\)*\\(\\.\\.\\. \\)*\\)")
+      (delete-region (match-beginning 1) (match-end 1)))
+    (buffer-string)))
+
 (provide 'ob-python)
 
 
-- 
2.3.2


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--
Kyle