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bug#28580: python.el: native completion setup failed

From: Noam Postavsky
Subject: bug#28580: python.el: native completion setup failed
Date: Sun, 24 Sep 2017 17:00:28 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.60 (gnu/linux)

Андрей Парамонов <address@hidden> writes:

> That should be suboptimal -- otherwise why the warning?
> What could make the "native" completion fail?

Does M-: (python-shell-completion-native-try) RET in the *Python* buffer
return nil?  Perhaps try putting some `message' calls into
python-shell-completion-native-get-completions? (Using the debugger is a
bit tricky due to the timing of process communication.)  Especially
check the contents of the current inside the `when' block at the end:

              ;; Grab output until our dummy completion used as
              ;; output end marker is found.
              (when (python-shell-accept-process-output
                     process python-shell-completion-native-output-timeout
                (re-search-backward "0__dummy_completion__" nil t)
                   (line-beginning-position) (point-min))
                  "[ \f\t\n\r\v()]+" t)
                 :test #'string=))

> How to check if it's really the case?

Try the recipe in https://debbugs.gnu.org/cgi/bugreport.cgi?bug=28051#8
and see if you suffer from that bug.

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