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ob-python: Session returns empty string if no return value

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* lisp/ob-python.el (org-babel-python--eval-ast): Change sessions to
return an empty string, instead of None, if there is no return value.
This commit is contained in:
Jack Kamm 2020-02-17 08:11:49 -08:00 committed by Bastien
parent a85f1603ec
commit 5fc4576548
2 changed files with 8 additions and 6 deletions
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12
etc/ORG-NEWS
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@ -12,13 +12,15 @@ Please send Org bug reports to mailto:emacs-orgmode@gnu.org.
* Version 9.4 (not yet released)
** Incompatible changes
*** Python session return values must be top-level expression statements
*** Change how Python sessions handle return values
Python blocks with ~:session :results value~ header arguments now only
return a value if the last line is a top-level expression statement,
otherwise the result is None. Also, None will now show up under
"#+RESULTS:", as it already did with ~:results value~ for non-session
blocks.
return a value if the last line is a top-level expression
statement. If the last line is not a top-level expression statement,
the block will return a blank (empty) result.
Also, a return value of ~None~ will now show up under "#+RESULTS:", as
it already did for non-session blocks.
*** In HTML export, change on how outline-container-* is set

2
lisp/ob-python.el
View file

@ -260,7 +260,7 @@ try:
__org_babel_python_final.value), '<string>', 'eval'))
else:
exec(compile(__org_babel_python_ast, '<string>', 'exec'))
__org_babel_python_final = None
__org_babel_python_final = ''
except Exception:
from traceback import format_exc
__org_babel_python_final = format_exc()