Fix completion retrieval parsing.

* progmodes/python.el (python-mode):
(python-util-strip-string): New function.
(python-shell-completion-get-completions): Use it.

* automated/python-tests.el (python-util-strip-string-1): New test.

Fixes: debbugs:17209

1 files changed, 12 insertions, 2 deletions

diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index f127d4b7028..f99a580b376 100644
--- a/lisp/progmodes/python.el
+++ b/lisp/progmodes/python.el
@@ -2463,8 +2463,10 @@ LINE is used to detect the context on how to complete given INPUT."
     (and completion-code
          (> (length input) 0)
          (with-current-buffer (process-buffer process)
-           (let ((completions (python-shell-send-string-no-output
-                               (format completion-code input) process)))
+           (let ((completions
+                  (python-util-strip-string
+                   (python-shell-send-string-no-output
+                    (format completion-code input) process))))
              (and (> (length completions) 2)
                   (split-string completions
                                 "^'\\|^\"\\|;\\|'$\\|\"$" t)))))))
@@ -3644,6 +3646,14 @@ returned as is."
               n (1- n)))
       (reverse acc))))
 
+(defun python-util-strip-string (string)
+  "Strip STRING whitespace and newlines from end and beginning."
+  (replace-regexp-in-string
+   (rx (or (: string-start (* (any whitespace ?\r ?\n)))
+           (: (* (any whitespace ?\r ?\n)) string-end)))
+   ""
+   string))
+
 
 (defun python-electric-pair-string-delimiter ()
   (when (and electric-pair-mode