GNU bug report logs - #25753
Python with libedit (macOS default) echoes input, breaks native completion

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Package: emacs; Reported by: charles@HIDDEN (Charles A. Roelli); merged with #21431, #22796, #26326; dated Thu, 16 Feb 2017 16:09:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

Disconnected #32042 from all other report(s). Request was from Noam Postavsky <npostavs@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Merged 21431 22796 25753 26326 32042. Request was from Noam Postavsky <npostavs@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Merged 21431 22796 25753 26326. Request was from npostavs@HIDDEN to control <at> debbugs.gnu.org. Full text available.

Merged 21431 25753 26326. Request was from npostavs@HIDDEN to control <at> debbugs.gnu.org. Full text available.

Merged 25753 26326. Request was from Noam Postavsky <npostavs@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Changed bug title to 'Python with libedit (macOS default) echoes input, breaks native completion' from '25.2; Python mode shell interaction not working 100%' Request was from npostavs@HIDDEN to control <at> debbugs.gnu.org. Full text available.

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From: npostavs@HIDDEN
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
 <87poifjsw2.fsf@HIDDEN>
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Date: Wed, 01 Mar 2017 18:00:34 -0500
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retitle 25753 Python with libedit (macOS default) echoes input, breaks native completion
quit

Eli Zaretskii <eliz@HIDDEN> writes:

>> From: npostavs@HIDDEN
>> Cc: 25753 <at> debbugs.gnu.org,  Eli Zaretskii <eliz@HIDDEN>
>> Date: Tue, 28 Feb 2017 09:07:02 -0500
>> 
>> Does this look okay?
>> 
>> --- i/etc/PROBLEMS
>> +++ w/etc/PROBLEMS
>
> Yes, thanks.

Pushed to emacs-25 [1: 6e788ef0e2].

1: 2017-03-01 17:56:20 -0500 6e788ef0e262fafc014c21f4ad52cc5dc9f1715b
  ; etc/PROBLEMS: Explain about the python+libedit problem (Bug#25753).

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

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Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
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> From: npostavs@HIDDEN
> Cc: 25753 <at> debbugs.gnu.org,  Eli Zaretskii <eliz@HIDDEN>
> Date: Tue, 28 Feb 2017 09:07:02 -0500
> 
> Does this look okay?
> 
> --- i/etc/PROBLEMS
> +++ w/etc/PROBLEMS

Yes, thanks.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

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From: npostavs@HIDDEN
To: charles@HIDDEN (Charles A. Roelli)
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
 <87poifjsw2.fsf@HIDDEN>
 <87poibgfyw.fsf@HIDDEN> <m24lzmm2oz.fsf@HIDDEN>
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 <87innwe5wq.fsf@HIDDEN> <m2y3wqfvtn.fsf@HIDDEN>
Date: Tue, 28 Feb 2017 09:07:02 -0500
In-Reply-To: <m2y3wqfvtn.fsf@HIDDEN> (Charles A. Roelli's message of "Tue,
 28 Feb 2017 11:34:12 +0100")
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charles@HIDDEN (Charles A. Roelli) writes:

> using `python-shell-interpreter' and `cat | python $'.  Python exited
> immediately with code 126, so I guess this solution does not work here.
> But I can't claim to understand any issues having to do with TTYs/"dumb
> terminals", so maybe I am missing something.

The equivalent for python.el would be approximately

(defun my-python-shell-calculate-command (&rest _)
  "sh -c \"cat | python -i\"")
(advice-add 'python-shell-calculate-command :override
            #'my-python-shell-calculate-command)

But this breaks native completion and prompt detection, due to IO
buffering I think.

>>>  So it would seem that `sudo easy_install
>>> gnureadline' is the right thing to run.  However that still does not fix
>>> the issue because python2.7/lib-dynload/ comes before
>>> python2.7/site-packages/ (where `gnureadline' is installed) in Python's
>>> $PATH equivalent, `sys.path'.  The solution, then, is to reorder the
>>> path somehow or get `readline.so' out of the way (maybe by renaming it
>>> -- cleaner suggestions welcome).
>>
>> I guess renaming should have the least amount of side-effects.
>
> Great.  This is what works for me:
>
> cd /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload
> mv readline.so readline.so.bak
>
> Hopefully we can add into emacs-25 a comment about this situation,
> advising Mac OS X users to install `gnureadline' with `easy_install
> gnureadline', then renaming `readline.so' to something not ending in
> `.so', if the native completion does not work immediately.

Does this look okay?

--- i/etc/PROBLEMS
+++ w/etc/PROBLEMS
@@ -463,8 +463,25 @@ problem by adding this to your .cshrc file:
         unset edit
         stty -icrnl -onlcr -echo susp ^Z
     endif
 
+*** In Inferior Python mode, input is echoed and native completion doesn't work.
+<https://debbugs.gnu.org/cgi/bugreport.cgi?bug=25753>
+
+This happens when python uses a libedit based readline module, which
+is the default on macOS.  This can be worked around by installing a
+GNU readline based module instead, for example, using setuptools
+
+    sudo easy_install gnureadline
+
+And then rename the system's readline so that it won't be loaded:
+
+    cd /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload
+    mv readline.so readline.so.bak
+
+See <https://pypi.python.org/pypi/gnureadline> for more details on
+installation.
+
 *** Emacs startup on GNU/Linux systems (and possibly other systems) is slow.
 
 This can happen if the system is misconfigured and Emacs can't get the
 full qualified domain name, FQDN.  You should have your FQDN in the

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

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From: charles@HIDDEN (Charles A. Roelli)
To: npostavs@HIDDEN
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
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Date: Tue, 28 Feb 2017 11:34:12 +0100
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On Sun, Feb 26 2017 at 09:14:45 pm, npostavs@HIDDEN wrote:

> charles@HIDDEN (Charles A. Roelli) writes:
>
>> On Sat, Feb 25 2017 at 09:34:10 am, npostavs@HIDDEN wrote:
>>
>>> Possibly setting `comint-process-echoes' could help, though I don't
>>> understand why there is echoing in the first place.
>>
>> Thanks for the pointer to that variable.  I ran this:
>>
>>    (add-hook 'inferior-python-mode-hook (lambda () (setq comint-process-echoes t)))
>>
>> and the commands at the prompt stopped echoing, but the support
>> functions still echoed.  So it looks like the problem has to be fixed on
>> the readline/libedit side of Python.
>
> This thread[1] might be somewhat relevant:
>
>     The problem is that eshell tells subprocesses that they're running in
>     a terminal (e.g., when queried via hIsTerminalDevice), but always
>     echos user input itself regardless of the tty's ECHO attribute. This
>     confuses libedit, which assumes that if it's connected to a terminal
>     then it can turn off echoing in order to run its own rich line editor.
>
> [1]:
> http://glasgow-haskell-users.haskell.narkive.com/vyeVJUEB/problem-with-echo-prompting-in-ghci-visible-in-emacs

Thanks.  FWIW, I tried this approach:

> Given this info, there's a fairly easy emacs haskell-mode work-around. I
> made a shell script "ghci-no-tty" in my ~/bin that contains
> 
> # So ghci+readline won't echo input
> cat | /usr/local/bin/ghci $*
> 
> and used "M-x customize-group" with the "haskell" group to set the "Haskell
> Program Name" variable to "/home/conal/bin/ghci-no-tty" (must be full path).
> 
> Now there's no more input echoing, and commands like automatic signature
> insertion ("\C-c\C-t") work again.

using `python-shell-interpreter' and `cat | python $'.  Python exited
immediately with code 126, so I guess this solution does not work here.
But I can't claim to understand any issues having to do with TTYs/"dumb
terminals", so maybe I am missing something.

>>  So it would seem that `sudo easy_install
>> gnureadline' is the right thing to run.  However that still does not fix
>> the issue because python2.7/lib-dynload/ comes before
>> python2.7/site-packages/ (where `gnureadline' is installed) in Python's
>> $PATH equivalent, `sys.path'.  The solution, then, is to reorder the
>> path somehow or get `readline.so' out of the way (maybe by renaming it
>> -- cleaner suggestions welcome).
>
> I guess renaming should have the least amount of side-effects.

Great.  This is what works for me:

cd /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload
mv readline.so readline.so.bak

Hopefully we can add into emacs-25 a comment about this situation,
advising Mac OS X users to install `gnureadline' with `easy_install
gnureadline', then renaming `readline.so' to something not ending in
`.so', if the native completion does not work immediately.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

Message received at 25753 <at> debbugs.gnu.org:

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From: npostavs@HIDDEN
To: charles@HIDDEN (Charles A. Roelli)
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
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Date: Sun, 26 Feb 2017 21:14:45 -0500
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charles@HIDDEN (Charles A. Roelli) writes:

> On Sat, Feb 25 2017 at 09:34:10 am, npostavs@HIDDEN wrote:
>
>> Possibly setting `comint-process-echoes' could help, though I don't
>> understand why there is echoing in the first place.
>
> Thanks for the pointer to that variable.  I ran this:
>
>    (add-hook 'inferior-python-mode-hook (lambda () (setq comint-process-echoes t)))
>
> and the commands at the prompt stopped echoing, but the support
> functions still echoed.  So it looks like the problem has to be fixed on
> the readline/libedit side of Python.

This thread[1] might be somewhat relevant:

    The problem is that eshell tells subprocesses that they're running in
    a terminal (e.g., when queried via hIsTerminalDevice), but always
    echos user input itself regardless of the tty's ECHO attribute. This
    confuses libedit, which assumes that if it's connected to a terminal
    then it can turn off echoing in order to run its own rich line editor.

[1]: http://glasgow-haskell-users.haskell.narkive.com/vyeVJUEB/problem-with-echo-prompting-in-ghci-visible-in-emacs

>  So it would seem that `sudo easy_install
> gnureadline' is the right thing to run.  However that still does not fix
> the issue because python2.7/lib-dynload/ comes before
> python2.7/site-packages/ (where `gnureadline' is installed) in Python's
> $PATH equivalent, `sys.path'.  The solution, then, is to reorder the
> path somehow or get `readline.so' out of the way (maybe by renaming it
> -- cleaner suggestions welcome).

I guess renaming should have the least amount of side-effects.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

Message received at 25753 <at> debbugs.gnu.org:

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From: charles@HIDDEN (Charles A. Roelli)
To: npostavs@HIDDEN
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
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On Sat, Feb 25 2017 at 09:34:10 am, npostavs@HIDDEN wrote:

> charles@HIDDEN (Charles A. Roelli) writes:
>
>> Could you please evaluate these forms with a running instance of
>> Python in Emacs?  My output follows each form.  It seems like the Mac
>> version of Python echoes the last command sent, and maybe python.el
>> does not expect this?
>
> Yes, I was going to ask if you also get this echoing for commands typed
> in at the prompt or is it just the support functions?  

Seems to be everywhere.

> Possibly setting `comint-process-echoes' could help, though I don't
> understand why there is echoing in the first place.

Thanks for the pointer to that variable.  I ran this:

   (add-hook 'inferior-python-mode-hook (lambda () (setq comint-process-echoes t)))

and the commands at the prompt stopped echoing, but the support
functions still echoed.  So it looks like the problem has to be fixed on
the readline/libedit side of Python.

> Here is what I get:
>
>     (python-shell-send-string-no-output "import os\nimport sys") ;=> ""
>     (python-shell-send-string-no-output "import os; import sys") ;=> ""
>     (python-ffap-module-path "os") ;=> "/usr/lib/python3.6/os.py"

Thanks.  I managed to fix my setup to give equivalent results (see below).

> By the way, it was reported[1] that using "homebrew" python avoids these
> issues, apparently that build uses GNU readline instead of libedit[2].
>
> [1]: https://github.com/jorgenschaefer/elpy/issues/887#issuecomment-282215656
> [2]: https://github.com/jorgenschaefer/elpy/issues/887#issuecomment-282332143

Thanks for setting me on this trail.  It turns out there's a package you
can install via `easy_install' (part of Python's `setuptools') called
`gnureadline' [1] (formerly called just `readline') which is supposed to
shadow python2.7/lib-dynload/'s `readline.so' with a relatively
up-to-date statically linked GNU replacement (for those of us with a
wacky `libedit'-ized version).  So it would seem that `sudo easy_install
gnureadline' is the right thing to run.  However that still does not fix
the issue because python2.7/lib-dynload/ comes before
python2.7/site-packages/ (where `gnureadline' is installed) in Python's
$PATH equivalent, `sys.path'.  The solution, then, is to reorder the
path somehow or get `readline.so' out of the way (maybe by renaming it
-- cleaner suggestions welcome).  I haven't tested that yet, but it
should work as expected.

At the moment I've been running M-x run-python from the
python2.7/site-packages/ folder where `readline.py' is stored, since
Python adds the path of the current directory to the front of
`sys.path'.  That means `readline.py' gets picked from there, which is
convenient, if not a little surprising at first.  With that done, the
forms I posted previously evaluate as expected, without the code
echoing.  Eldoc also works fine.  Maybe we can add a notice about this
somewhere in python.el in emacs-25.  I'm not sure yet about the best way
to handle the path ordering issue between `readline.so' and
`gnureadline'.

[1] https://pypi.python.org/pypi/gnureadline

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

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From: npostavs@HIDDEN
To: charles@HIDDEN (Charles A. Roelli)
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
 <87poifjsw2.fsf@HIDDEN>
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Date: Sat, 25 Feb 2017 09:34:10 -0500
In-Reply-To: <m2shn2742b.fsf@HIDDEN> (Charles A. Roelli's message of "Sat,
 25 Feb 2017 15:11:56 +0100")
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charles@HIDDEN (Charles A. Roelli) writes:

> Could you please evaluate these forms with a running instance of
> Python in Emacs?  My output follows each form.  It seems like the Mac
> version of Python echoes the last command sent, and maybe python.el
> does not expect this?

Yes, I was going to ask if you also get this echoing for commands typed
in at the prompt or is it just the support functions?  Possibly setting
`comint-process-echoes' could help, though I don't understand why there
is echoing in the first place.

Here is what I get:

    (python-shell-send-string-no-output "import os\nimport sys") ;=> ""
    (python-shell-send-string-no-output "import os; import sys") ;=> ""
    (python-ffap-module-path "os") ;=> "/usr/lib/python3.6/os.py"

By the way, it was reported[1] that using "homebrew" python avoids these
issues, apparently that build uses GNU readline instead of libedit[2].

[1]: https://github.com/jorgenschaefer/elpy/issues/887#issuecomment-282215656
[2]: https://github.com/jorgenschaefer/elpy/issues/887#issuecomment-282332143

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

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From: charles@HIDDEN (Charles A. Roelli)
To: npostavs@HIDDEN
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
 <87poifjsw2.fsf@HIDDEN>
 <87poibgfyw.fsf@HIDDEN> <m24lzmm2oz.fsf@HIDDEN>
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Date: Sat, 25 Feb 2017 15:11:56 +0100
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Could you please evaluate these forms with a running instance of
Python in Emacs?  My output follows each form.  It seems like the Mac
version of Python echoes the last command sent, and maybe python.el
does not expect this?  Notice in the third example, the correct result
appears, but is preceded by the code sent to the interpreter (which
should be omitted as garbage).

(python-shell-send-string-no-output "import os\nimport sys")
=> "import codecs, os;__pyfile = codecs.open('''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py167Tvh''', encoding='''utf-8''');__code = __pyfile.read().encode('''utf-8''');__pyfile.close();os.remove('''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py167Tvh''');exec(compile(__code, '''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py167Tvh''', 'exec'));"

(python-shell-send-string-no-output "import os; import sys")
=> "import os; import sys"

(python-ffap-module-path "os")
=> "import codecs, os;__pyfile = codecs.open('''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py167tDu''', encoding='''utf-8''');__code = __pyfile.read().encode('''utf-8''');__pyfile.close();os.remove('''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py167tDu''');exec(compile(__code, '''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py167tDu''', 'exec'));^M
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.py"

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

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From: charles@HIDDEN (Charles A. Roelli)
To: npostavs@HIDDEN
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
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Date: Fri, 24 Feb 2017 11:19:46 +0100
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On Thu, Feb 23 2017 at 09:20:01 am, npostavs@HIDDEN wrote:

> charles@HIDDEN (Charles A. Roelli) writes:
>>
>> Tested, and it has the same problem.  Here is what *Python* normally
>> looks like at the start, run from M-x run-python in emacs -Q:
>>
>> Python 2.7.12 (v2.7.12:d33e0cf91556, Jun 26 2016, 12:10:39) 
>> [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
>> Type "help", "copyright", "credits" or "license" for more information.
>>>>> import codecs, os;__pyfile =
>>>>> codecs.open('''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py16611qgD''',
>>>>> encoding='''utf-8''');__code =
>>>>> __pyfile.read().encode('''utf-8''');__pyfile.close();os.remove('''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py16611qgD''');exec(compile(__code,
>>>>> '''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py16611qgD''',
>>>>> 'exec'));
>> python.el: native completion setup loaded
>>
>> It seems like the line starting with ">>> " should not be printed, if
>> <nyc4bos@HIDDEN>'s test output is deemed to be running more or less
>> correctly.  Maybe that can point us in the right direction?
>
> Hmm, it's odd, though since you're still getting the "setup loaded"
> message, the code *is* getting evaluated anyway, so it's likely that
> this problem is not directly related.  Let's see if we can track it down
> anyway, try the loading the attached as
>
>     emacs -Q -l py-trace-bad-output.el
>
> and see if anything shows up in *Messages*.
>
> (require 'python)
>
> (advice-add
>  'python-shell-make-comint :filter-return
>  (lambda (proc-buffer-name)
>    (with-current-buffer proc-buffer-name
>      (add-hook 'after-change-functions
>                (lambda (beg end len)
>                  (ignore-errors
>                    (save-excursion
>                      (save-match-data
>                        (when (string-prefix-p "import codecs" (buffer-substring beg end))
>                          (backtrace))))))
>                nil t))
>    proc-buffer-name))
>
> (run-python)
>
> (switch-to-buffer "*Python*")
> (display-buffer "*Messages*")
>

Here is what I got:

Loading ~/Downloads/py-trace-bad-output.el (source)...done
  backtrace()
  (progn (backtrace))
  (if (string-prefix-p "import codecs" (buffer-substring beg end)) (progn (backtrace)))
  (progn (if (string-prefix-p "import codecs" (buffer-substring beg end)) (progn (backtrace))))
  (unwind-protect (progn (if (string-prefix-p "import codecs" (buffer-substring beg end)) (progn (backtrace)))) (set-match-data save-match-data-internal (quote evaporate)))
  (let ((save-match-data-internal (match-data))) (unwind-protect (progn (if (string-prefix-p "import codecs" (buffer-substring beg end)) (progn (backtrace)))) (set-match-data save-match-data-internal (quote evaporate))))
  (save-excursion (let ((save-match-data-internal (match-data))) (unwind-protect (progn (if (string-prefix-p "import codecs" (buffer-substring beg end)) (progn (backtrace)))) (set-match-data save-match-data-internal (quote evaporate)))))
  (progn (save-excursion (let ((save-match-data-internal (match-data))) (unwind-protect (progn (if (string-prefix-p "import codecs" (buffer-substring beg end)) (progn (backtrace)))) (set-match-data save-match-data-internal (quote evaporate))))))
  (condition-case nil (progn (save-excursion (let ((save-match-data-internal (match-data))) (unwind-protect (progn (if (string-prefix-p "import codecs" ...) (progn ...))) (set-match-data save-match-data-internal (quote evaporate)))))) (error nil))
  (lambda (beg end len) (condition-case nil (progn (save-excursion (let ((save-match-data-internal (match-data))) (unwind-protect (progn (if ... ...)) (set-match-data save-match-data-internal (quote evaporate)))))) (error nil)))(191 556 0)
  comint-output-filter(#<process Python> "import codecs, os;__pyfile = codecs.open('''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py683UGH''', encoding='''utf-8''');__code = __pyfile.read().encode('''utf-8''');__pyfile.close();os.remove('''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py683UGH''');exec(compile(__code, '''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py683UGH''', 'exec'));
")
  accept-process-output(#<process Python> 1.0)
  python-shell-accept-process-output(#<process Python> 1.0)
  python-shell-completion-native-setup()
  python-shell-completion-native-turn-on-maybe(t)
  python-shell-completion-native-turn-on-maybe-with-msg()
  run-hooks(python-shell-first-prompt-hook)
  python-shell-comint-watch-for-first-prompt-output-filter(">>> ")
  run-hook-with-args(python-shell-comint-watch-for-first-prompt-output-filter ">>> ")
  comint-output-filter(#<process Python> ">>> ")
  read-event(nil t 2)
  sit-for(2)
  execute-extended-command(nil "load-file" "load-file")
  funcall-interactively(execute-extended-command nil "load-file" "load-file")
  call-interactively(execute-extended-command nil nil)
  command-execute(execute-extended-command)

Shell native completion is disabled, using fallback

>>> Can you test the python code from python-shell-completion-native-setup
>>> outside of Emacs, e.g., save it to a file called 'native-completion.py'
>>> and then run 'python -i native-completion.py' and then type an
>>> underscore and hit <tab>.
>>
>> I get the following:
>>
>>>>> ___package__
>> __PYTHON_EL_native_completion_setup
>> __name__
>> __doc__
>> __import__
>> __debug__
>>
>> Interestingly, none of the dummy completions pop up.
>
> This seems to be the core of the problem.  I gather that macOS uses
> libedit instead of readline by default, perhaps that is the source of
> incompatibility.  Can you figure out how to change the python code so
> that the dummy completions do show up?

Yes, I will look into it.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

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From: npostavs@HIDDEN
To: charles@HIDDEN (Charles A. Roelli)
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
 <87poifjsw2.fsf@HIDDEN>
 <87poibgfyw.fsf@HIDDEN> <m24lzmm2oz.fsf@HIDDEN>
Date: Thu, 23 Feb 2017 09:20:01 -0500
In-Reply-To: <m24lzmm2oz.fsf@HIDDEN> (Charles A. Roelli's message of "Wed,
 22 Feb 2017 20:43:24 +0100")
Message-ID: <87o9xtf0q6.fsf@HIDDEN>
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--=-=-=
Content-Type: text/plain

charles@HIDDEN (Charles A. Roelli) writes:
>
> Tested, and it has the same problem.  Here is what *Python* normally
> looks like at the start, run from M-x run-python in emacs -Q:
>
> Python 2.7.12 (v2.7.12:d33e0cf91556, Jun 26 2016, 12:10:39) 
> [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import codecs, os;__pyfile =
>>>> codecs.open('''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py16611qgD''',
>>>> encoding='''utf-8''');__code =
>>>> __pyfile.read().encode('''utf-8''');__pyfile.close();os.remove('''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py16611qgD''');exec(compile(__code,
>>>> '''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py16611qgD''',
>>>> 'exec'));
> python.el: native completion setup loaded
>
> It seems like the line starting with ">>> " should not be printed, if
> <nyc4bos@HIDDEN>'s test output is deemed to be running more or less
> correctly.  Maybe that can point us in the right direction?

Hmm, it's odd, though since you're still getting the "setup loaded"
message, the code *is* getting evaluated anyway, so it's likely that
this problem is not directly related.  Let's see if we can track it down
anyway, try the loading the attached as

    emacs -Q -l py-trace-bad-output.el

and see if anything shows up in *Messages*.


--=-=-=
Content-Type: application/emacs-lisp
Content-Disposition: attachment; filename=py-trace-bad-output.el
Content-Transfer-Encoding: quoted-printable
Content-Description: tracing code

(require 'python)

(advice-add
 'python-shell-make-comint :filter-return
 (lambda (proc-buffer-name)
   (with-current-buffer proc-buffer-name
     (add-hook 'after-change-functions
               (lambda (beg end len)
                 (ignore-errors
                   (save-excursion
                     (save-match-data
                       (when (string-prefix-p "import codecs" (buffer-subst=
ring beg end))
                         (backtrace))))))
               nil t))
   proc-buffer-name))

(run-python)

(switch-to-buffer "*Python*")
(display-buffer "*Messages*")

--=-=-=
Content-Type: text/plain


>> Can you test the python code from python-shell-completion-native-setup
>> outside of Emacs, e.g., save it to a file called 'native-completion.py'
>> and then run 'python -i native-completion.py' and then type an
>> underscore and hit <tab>.
>
> I get the following:
>
>>>> ___package__
> __PYTHON_EL_native_completion_setup
> __name__
> __doc__
> __import__
> __debug__
>
> Interestingly, none of the dummy completions pop up.

This seems to be the core of the problem.  I gather that macOS uses
libedit instead of readline by default, perhaps that is the source of
incompatibility.  Can you figure out how to change the python code so
that the dummy completions do show up?

--=-=-=--

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

Message received at 25753 <at> debbugs.gnu.org:

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From: charles@HIDDEN (Charles A. Roelli)
To: npostavs@HIDDEN
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
 <87poifjsw2.fsf@HIDDEN>
 <87poibgfyw.fsf@HIDDEN>
Date: Wed, 22 Feb 2017 20:43:24 +0100
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 (npostavs@HIDDEN's message of "Tue, 21 Feb 2017
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> As I've said, I don't think rc2 would change this, but since it's come
> out now, please test it. 

Tested, and it has the same problem.  Here is what *Python* normally
looks like at the start, run from M-x run-python in emacs -Q:

Python 2.7.12 (v2.7.12:d33e0cf91556, Jun 26 2016, 12:10:39) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import codecs, os;__pyfile = codecs.open('''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py16611qgD''', encoding='''utf-8''');__code = __pyfile.read().encode('''utf-8''');__pyfile.close();os.remove('''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py16611qgD''');exec(compile(__code, '''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py16611qgD''', 'exec'));
python.el: native completion setup loaded

It seems like the line starting with ">>> " should not be printed, if
<nyc4bos@HIDDEN>'s test output is deemed to be running more or less
correctly.  Maybe that can point us in the right direction?

> Can you test the python code from python-shell-completion-native-setup
> outside of Emacs, e.g., save it to a file called 'native-completion.py'
> and then run 'python -i native-completion.py' and then type an
> underscore and hit <tab>.

I get the following:

>>> ___package__
__PYTHON_EL_native_completion_setup
__name__
__doc__
__import__
__debug__

Interestingly, none of the dummy completions pop up.

> Can you try load the attached file in Emacs?  Does it show similar
> output in the "*py native complete test*" buffer?
> 
>     emacs -Q -l py-native-completion.el

I get no completions with this -- here is all that shows up:

Python 2.7.12 (v2.7.12:d33e0cf91556, Jun 26 2016, 12:10:39) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> python.el: native completion setup loaded
>>> 

> Also post the contents of buffer " *Python completions redirect*"
> after doing M-x run-python.

- emacs -Q
- M-x run-python
- C-x b " *Python completions redirect*"

It's this: "_	^H^H" (space in the middle is a tab character).

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

Message received at 25753 <at> debbugs.gnu.org:

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From: npostavs@HIDDEN
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
 <87poifjsw2.fsf@HIDDEN>
Date: Tue, 21 Feb 2017 20:40:55 -0500
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 (npostavs@HIDDEN's message of "Sat, 18 Feb 2017 12:44:29
 -0500")
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npostavs@HIDDEN writes:

> Eli Zaretskii <eliz@HIDDEN> writes:
>
>>> From: charles@HIDDEN (Charles A. Roelli)
>>> Date: Thu, 16 Feb 2017 17:07:48 +0100
>>> 
>>> In emacs 25.2 (rc1) and 25.1, interaction with the Python shell does not
>>> seem to be working fully.  Python version is '2.7.12 (v2.7.12:d33e0cf91556,
>>> Jun 26 2016, 12:10:39) [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)]', and
>>> this is on Snow Leopard.
>>
>> Please try the next RC (should be out in a few days), I think we fixed
>> that there.
>
> AFAIK, the only change since rc1 is to add "ipython" to
> python-shell-completion-native-disabled-interpreters.  And that should
> not affect the problem reported here, which does not seem to involve
> ipython.

As I've said, I don't think rc2 would change this, but since it's come
out now, please test it.  Assuming rc2 still has the problem, please try
the tests I posted in
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=25753#29 and
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=25753#35.  Also post the
contents of buffer " *Python completions redirect*" after doing M-x
run-python.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

Message received at 25753 <at> debbugs.gnu.org:

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From: Live System User <nyc4bos@HIDDEN>
To: npostavs@HIDDEN
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
In-Reply-To: <87vas3hdjb.fsf@HIDDEN>
 (npostavs@HIDDEN's message of "Tue, 21 Feb 2017
 08:35:52 -0500")
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
 <87poifjsw2.fsf@HIDDEN> <87lgt2rz4j.fsf@HIDDEN>
 <CAM-tV--CV5jfJS3S0J6toHFjfB7suEhx0ASVKOpBc8ONknjfGQ@HIDDEN>
 <87d1eermwb.fsf@HIDDEN>
 <CAM-tV--Y3_COVU7-AbMJpHw1Jvg2+VWAvbcgcGmvf6sw1m6VFA@HIDDEN>
 <878tp1sw7y.fsf@HIDDEN> <87wpclir72.fsf@HIDDEN>
 <871sussd9b.fsf@HIDDEN> <87bmtwiact.fsf@HIDDEN>
 <87tw7oqkw2.fsf@HIDDEN> <87vas3hdjb.fsf@HIDDEN>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)
Date: Tue, 21 Feb 2017 18:17:55 -0500
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npostavs@HIDDEN writes:

> Live System User <nyc4bos@HIDDEN> writes:
>
>> npostavs@HIDDEN writes:
>>
>> [...]
>>>
>>> Can you try load the attached file in Emacs?  Does it show similar
>>> output in the "*py native complete test*" buffer?
>>>
>>>     emacs -Q -l py-native-completion.el
>>
>>       Attached are my results.
>
> Hmm, that looks like it should be working.  Wait, when you said
>
>     I was already using that (wrapped in a "with-eval-after-load
>     'python") from:
>
>     https://github.com/jorgenschaefer/elpy/issues/887#issuecomment-275175119
>
>     to no avail.
>
> You meant the code from that exact comment?  That's a broken solution,
> try this instead:
>
>     (with-eval-after-load 'python
>       (defun python-shell-completion-native-try ()
>         "Return non-nil if can trigger native completion."
>         (let ((python-shell-completion-native-enable t)
>               (python-shell-completion-native-output-timeout
>                python-shell-completion-native-try-output-timeout))
>           (python-shell-completion-native-get-completions
>            (get-buffer-process (current-buffer))
>            nil "_"))))

    Your version of the solution works for me.

    Thanks for your effort!.


>
> If it's still not working, please post the contents of buffer " *Python
> completions redirect*" (note the leading space).

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

Message received at 25753 <at> debbugs.gnu.org:

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From: npostavs@HIDDEN
To: Live System User <nyc4bos@HIDDEN>
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
 <87poifjsw2.fsf@HIDDEN> <87lgt2rz4j.fsf@HIDDEN>
 <CAM-tV--CV5jfJS3S0J6toHFjfB7suEhx0ASVKOpBc8ONknjfGQ@HIDDEN>
 <87d1eermwb.fsf@HIDDEN>
 <CAM-tV--Y3_COVU7-AbMJpHw1Jvg2+VWAvbcgcGmvf6sw1m6VFA@HIDDEN>
 <878tp1sw7y.fsf@HIDDEN> <87wpclir72.fsf@HIDDEN>
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Date: Tue, 21 Feb 2017 08:35:52 -0500
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 Feb 2017 22:32:13 -0500")
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Live System User <nyc4bos@HIDDEN> writes:

> npostavs@HIDDEN writes:
>
> [...]
>>
>> Can you try load the attached file in Emacs?  Does it show similar
>> output in the "*py native complete test*" buffer?
>>
>>     emacs -Q -l py-native-completion.el
>
>       Attached are my results.

Hmm, that looks like it should be working.  Wait, when you said

    I was already using that (wrapped in a "with-eval-after-load
    'python") from:

    https://github.com/jorgenschaefer/elpy/issues/887#issuecomment-275175119

    to no avail.

You meant the code from that exact comment?  That's a broken solution,
try this instead:

    (with-eval-after-load 'python
      (defun python-shell-completion-native-try ()
        "Return non-nil if can trigger native completion."
        (let ((python-shell-completion-native-enable t)
              (python-shell-completion-native-output-timeout
               python-shell-completion-native-try-output-timeout))
          (python-shell-completion-native-get-completions
           (get-buffer-process (current-buffer))
           nil "_"))))

If it's still not working, please post the contents of buffer " *Python
completions redirect*" (note the leading space).

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

Message received at 25753 <at> debbugs.gnu.org:

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From: Live System User <nyc4bos@HIDDEN>
To: npostavs@HIDDEN
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
In-Reply-To: <87bmtwiact.fsf@HIDDEN>
 (npostavs@HIDDEN's message of "Mon, 20 Feb 2017
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 <87d1eermwb.fsf@HIDDEN>
 <CAM-tV--Y3_COVU7-AbMJpHw1Jvg2+VWAvbcgcGmvf6sw1m6VFA@HIDDEN>
 <878tp1sw7y.fsf@HIDDEN> <87wpclir72.fsf@HIDDEN>
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--=-=-=
Content-Type: text/plain

npostavs@HIDDEN writes:

[...]
>
> Can you try load the attached file in Emacs?  Does it show similar
> output in the "*py native complete test*" buffer?
>
>     emacs -Q -l py-native-completion.el

      Attached are my results.


--=-=-=
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Content-Transfer-Encoding: base64
Content-Description: py-native-completion results

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--=-=-=--

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

Message received at 25753 <at> debbugs.gnu.org:

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From: npostavs@HIDDEN
To: Live System User <nyc4bos@HIDDEN>
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
 <87poifjsw2.fsf@HIDDEN> <87lgt2rz4j.fsf@HIDDEN>
 <CAM-tV--CV5jfJS3S0J6toHFjfB7suEhx0ASVKOpBc8ONknjfGQ@HIDDEN>
 <87d1eermwb.fsf@HIDDEN>
 <CAM-tV--Y3_COVU7-AbMJpHw1Jvg2+VWAvbcgcGmvf6sw1m6VFA@HIDDEN>
 <878tp1sw7y.fsf@HIDDEN> <87wpclir72.fsf@HIDDEN>
 <871sussd9b.fsf@HIDDEN>
Date: Mon, 20 Feb 2017 20:46:58 -0500
In-Reply-To: <871sussd9b.fsf@HIDDEN> (Live System User's message of "Mon, 20
 Feb 2017 17:34:08 -0500")
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--=-=-=
Content-Type: text/plain; charset=utf-8
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Live System User <nyc4bos@HIDDEN> writes:

> npostavs@HIDDEN writes:
>
>> Can you test the python code from python-shell-completion-native-setup
>> outside of Emacs, e.g., save it to a file called 'native-completion.py'
>> and then run 'python -i native-completion.py' and then type an
>> underscore and hit <tab>.
>>
>
>       I get the same:
>
> $ =E2=96=B8 python2 -i native-completion.py
> python.el: native completion setup loaded
>>>> ___package__
> __PYTHON_EL_native_completion_setup
> __name__
> __doc__
> __import__
> __debug__
>
> 0__dummy_completion__  1__dummy_completion__=20=20
>>>> _

Can you try load the attached file in Emacs?  Does it show similar
output in the "*py native complete test*" buffer?

    emacs -Q -l py-native-completion.el


--=-=-=
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--=-=-=--

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

Message received at 25753 <at> debbugs.gnu.org:

Received: (at 25753) by debbugs.gnu.org; 20 Feb 2017 22:34:20 +0000
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From: Live System User <nyc4bos@HIDDEN>
To: npostavs@HIDDEN
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
In-Reply-To: <87wpclir72.fsf@HIDDEN>
 (npostavs@HIDDEN's message of "Sun, 19 Feb 2017
 20:30:57 -0500")
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
 <87poifjsw2.fsf@HIDDEN> <87lgt2rz4j.fsf@HIDDEN>
 <CAM-tV--CV5jfJS3S0J6toHFjfB7suEhx0ASVKOpBc8ONknjfGQ@HIDDEN>
 <87d1eermwb.fsf@HIDDEN>
 <CAM-tV--Y3_COVU7-AbMJpHw1Jvg2+VWAvbcgcGmvf6sw1m6VFA@HIDDEN>
 <878tp1sw7y.fsf@HIDDEN> <87wpclir72.fsf@HIDDEN>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)
Date: Mon, 20 Feb 2017 17:34:08 -0500
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npostavs@HIDDEN writes:

> Live System User <nyc4bos@HIDDEN> writes:
>>     I was already using that (wrapped in a "with-eval-after-load
>>     'python") from:
>>
>>     https://github.com/jorgenschaefer/elpy/issues/887#issuecomment-27517=
5119
>>
>>     to no avail.
>
> Can you test the python code from python-shell-completion-native-setup
> outside of Emacs, e.g., save it to a file called 'native-completion.py'
> and then run 'python -i native-completion.py' and then type an
> underscore and hit <tab>.
>
> With 2.7.13, I get
>
>     $ python2 -i native-completion.py=20
>     python.el: native completion setup loaded
>     >>> ___package__
>     __PYTHON_EL_native_completion_setup
>     __name__
>     __doc__
>     __import__
>     __debug__
>
>     0__dummy_completion__  1__dummy_completion__=20=20
>     >>> _

      I get the same:

$ =E2=96=B8 python2 -i native-completion.py
python.el: native completion setup loaded
>>> ___package__
__PYTHON_EL_native_completion_setup
__name__
__doc__
__import__
__debug__

0__dummy_completion__  1__dummy_completion__=20=20
>>> _

    In Emacs I still get the (visable) *Warning* buffer with contents:

Warning (python): Your =E2=80=98python-shell-interpreter=E2=80=99 doesn=E2=
=80=99t seem to support readline, yet =E2=80=98python-shell-completion-nati=
ve=E2=80=99 was t and "python" is not part of the =E2=80=98python-shell-com=
pletion-native-disabled-interpreters=E2=80=99 list.  Native completions hav=
e been disabled locally.=20


>
> With python 3.6.0 I get:
>
>     $ python -i native-completion.py=20
>     python.el: native completion setup loaded
>     >>> ___name__
>     __doc__
>     __package__
>     __loader__
>     __spec__
>     __annotations__
>     __cached__
>     __PYTHON_EL_native_completion_setup
>     __build_class__
>     __import__
>     __debug__
>
>     0__dummy_completion__  1__dummy_completion__=20=20
>     >>> _

      With Python 3.5.2 I get something a little different:

liveuser@localhost:~$ =E2=96=B8  python3 -i native-completion.py
python.el: native completion setup loaded
>>> ___loader__
__spec__
__cached__
__name__
__package__
__PYTHON_EL_native_completion_setup
__doc__
__build_class__
__import__
__debug__

0__dummy_completion__  1__dummy_completion__=20=20
>>> _

    Thanks.
=20=20=20=20

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

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From: npostavs@HIDDEN
To: Live System User <nyc4bos@HIDDEN>
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
 <87poifjsw2.fsf@HIDDEN> <87lgt2rz4j.fsf@HIDDEN>
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Date: Sun, 19 Feb 2017 20:30:57 -0500
In-Reply-To: <878tp1sw7y.fsf@HIDDEN> (Live System User's message of "Sun, 19
 Feb 2017 16:32:17 -0500")
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Live System User <nyc4bos@HIDDEN> writes:
>     I was already using that (wrapped in a "with-eval-after-load
>     'python") from:
>
>     https://github.com/jorgenschaefer/elpy/issues/887#issuecomment-275175119
>
>     to no avail.

Can you test the python code from python-shell-completion-native-setup
outside of Emacs, e.g., save it to a file called 'native-completion.py'
and then run 'python -i native-completion.py' and then type an
underscore and hit <tab>.

With 2.7.13, I get

    $ python2 -i native-completion.py 
    python.el: native completion setup loaded
    >>> ___package__
    __PYTHON_EL_native_completion_setup
    __name__
    __doc__
    __import__
    __debug__

    0__dummy_completion__  1__dummy_completion__  
    >>> _

With python 3.6.0 I get:

    $ python -i native-completion.py 
    python.el: native completion setup loaded
    >>> ___name__
    __doc__
    __package__
    __loader__
    __spec__
    __annotations__
    __cached__
    __PYTHON_EL_native_completion_setup
    __build_class__
    __import__
    __debug__

    0__dummy_completion__  1__dummy_completion__  
    >>> _

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

Message received at 25753 <at> debbugs.gnu.org:

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From: Live System User <nyc4bos@HIDDEN>
To: Noam Postavsky <npostavs@HIDDEN>
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
 <87poifjsw2.fsf@HIDDEN> <87lgt2rz4j.fsf@HIDDEN>
 <CAM-tV--CV5jfJS3S0J6toHFjfB7suEhx0ASVKOpBc8ONknjfGQ@HIDDEN>
 <87d1eermwb.fsf@HIDDEN>
 <CAM-tV--Y3_COVU7-AbMJpHw1Jvg2+VWAvbcgcGmvf6sw1m6VFA@HIDDEN>
Date: Sun, 19 Feb 2017 16:32:17 -0500
In-Reply-To: <CAM-tV--Y3_COVU7-AbMJpHw1Jvg2+VWAvbcgcGmvf6sw1m6VFA@HIDDEN>
 (Noam Postavsky's message of "Sun, 19 Feb 2017 15:00:03 -0500")
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Noam Postavsky <npostavs@HIDDEN> writes:

> On Sun, Feb 19, 2017 at 2:39 PM, Live System User <nyc4bos@HIDDEN> wrote:
>>>
>>> Do you see this with 25.2-rc1 on GNU/Linux though?
>>
>>   Fedora doesn't have that version available currently.
>
> Can you try it after M-x load-library python RET and then evaluate
> this new definition of python-shell-completion-native-try:
>
> (defun python-shell-completion-native-try ()
>   "Return non-nil if can trigger native completion."
>   (let ((python-shell-completion-native-enable t)
>         (python-shell-completion-native-output-timeout
>          python-shell-completion-native-try-output-timeout))
>     (python-shell-completion-native-get-completions
>      (get-buffer-process (current-buffer))
>      nil "_")))

    I was already using that (wrapped in a "with-eval-after-load
    'python") from:

    https://github.com/jorgenschaefer/elpy/issues/887#issuecomment-275175119

    to no avail.

>
>>
>>   I did, however, look into the Python modules having to do with
>>   "readline"(completion).
>>
>>   I discovered that if I used the "readline" from "pyrepl.py"instead
>>   of the standard default one, then even though that warning still
>>   occured in a *Warning* buffer in Emacs, I never saw it -- I just
>>   saw   the *Python* buffer and my source buffer, as expected.
>
> I'm not sure what "pyrepl" is or to "use" it, but just looking at web
> search results, it seems to be connected to pypy, which is in the list
> of python-shell-completion-native-disabled-interpreters, could that be
> related?

  Not really but it makes allowances on whether or not pypy.py is
  currently loaded.

  Here is an important piece of pyrepl that appears to be revelent
  to how it deals with input and output from terminals (TTYs) and
  non-terminals:


    if '__pypy__' in sys.builtin_module_names:    # PyPy

        def _old_raw_input(prompt=''):
            # sys.__raw_input__() is only called when stdin and stdout are
            # as expected and are ttys.  If it is the case, then get_reader()
            # should not really fail in _wrapper.raw_input().  If it still
            # does, then we will just cancel the redirection and call again
            # the built-in raw_input().
            try:
                del sys.__raw_input__
            except AttributeError:
                pass
            return raw_input(prompt)
        sys.__raw_input__ = _wrapper.raw_input

    else:
        # this is not really what readline.c does.  Better than nothing I guess
        import __builtin__
        _old_raw_input = __builtin__.raw_input
        __builtin__.raw_input = _wrapper.raw_input

_old_raw_input = None


  I think that this related in the fact that the Emacs interaction is
  not with a real TTY (it doesn't have defined or tigetstr-retrievable
  terminal capabilities (curses) like how to do operations like "clear",
  "cup" or "horizontal" positioning).

  Thanks.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

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Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
To: Live System User <nyc4bos@HIDDEN>
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On Sun, Feb 19, 2017 at 2:39 PM, Live System User <nyc4bos@HIDDEN> wrote:
>>
>> Do you see this with 25.2-rc1 on GNU/Linux though?
>
>   Fedora doesn't have that version available currently.

Can you try it after M-x load-library python RET and then evaluate
this new definition of python-shell-completion-native-try:

(defun python-shell-completion-native-try ()
  "Return non-nil if can trigger native completion."
  (let ((python-shell-completion-native-enable t)
        (python-shell-completion-native-output-timeout
         python-shell-completion-native-try-output-timeout))
    (python-shell-completion-native-get-completions
     (get-buffer-process (current-buffer))
     nil "_")))

>
>   I did, however, look into the Python modules having to do with
>   "readline"(completion).
>
>   I discovered that if I used the "readline" from "pyrepl.py"instead
>   of the standard default one, then even though that warning still
>   occured in a *Warning* buffer in Emacs, I never saw it -- I just
>   saw   the *Python* buffer and my source buffer, as expected.

I'm not sure what "pyrepl" is or to "use" it, but just looking at web
search results, it seems to be connected to pypy, which is in the list
of python-shell-completion-native-disabled-interpreters, could that be
related?

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

Message received at 25753 <at> debbugs.gnu.org:

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From: Live System User <nyc4bos@HIDDEN>
To: Noam Postavsky <npostavs@HIDDEN>
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
 <87poifjsw2.fsf@HIDDEN> <87lgt2rz4j.fsf@HIDDEN>
 <CAM-tV--CV5jfJS3S0J6toHFjfB7suEhx0ASVKOpBc8ONknjfGQ@HIDDEN>
Date: Sun, 19 Feb 2017 14:39:00 -0500
In-Reply-To: <CAM-tV--CV5jfJS3S0J6toHFjfB7suEhx0ASVKOpBc8ONknjfGQ@HIDDEN>
 (Noam Postavsky's message of "Sun, 19 Feb 2017 10:26:45 -0500")
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Noam Postavsky <npostavs@HIDDEN> writes:

> On Sun, Feb 19, 2017 at 10:14 AM, Live System User <nyc4bos@HIDDEN> wrot=
e:
>>>
>>> It might be something macOS specific, because I don't see any problems
>>> on Arch GNU/Linux with python 2.7.13.
>>
>>   I see the problem on GNU/Linux (Fedora):
>>
>> Warning (python): Your =E2=80=98python-shell-interpreter=E2=80=99 doesn=
=E2=80=99t seem to
> [...]
>> In GNU Emacs 25.1.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.20.9)
>>  of 2016-10-13 built on buildvm-05.phx2.fedoraproject.org
>> Windowing system distributor 'Fedora Project', version 11.0.11803000
>
> Do you see this with 25.2-rc1 on GNU/Linux though?

  Fedora doesn't have that version available currently.
=20=20
>
> There *was* a change since 25.1 (although supposedly that only
> affected python 3). Do you have "set colored-stats on" in your
> ~/.inputrc? There was a report in #24401 of that causing trouble.

  I don't have a ~/.input file.

  I did, however, look into the Python modules having to do with
  "readline"(completion).

  I discovered that if I used the "readline" from "pyrepl.py"instead
  of the standard default one, then even though that warning still
  occured in a *Warning* buffer in Emacs, I never saw it -- I just
  saw   the *Python* buffer and my source buffer, as expected.

  I haven't looked deeper as to why "pyrepl"'s readline is able to
  not display the *Warning* buffer while Python's standard default
  readline displays the *Warning* buffer until it is dismissed.

  Thanks.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

Message received at 25753 <at> debbugs.gnu.org:

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Date: Sun, 19 Feb 2017 10:26:45 -0500
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Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
To: Live System User <nyc4bos@HIDDEN>
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On Sun, Feb 19, 2017 at 10:14 AM, Live System User <nyc4bos@HIDDEN> wrote:
>>
>> It might be something macOS specific, because I don't see any problems
>> on Arch GNU/Linux with python 2.7.13.
>
>   I see the problem on GNU/Linux (Fedora):
>
> Warning (python): Your =E2=80=98python-shell-interpreter=E2=80=99 doesn=
=E2=80=99t seem to
[...]
> In GNU Emacs 25.1.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.20.9)
>  of 2016-10-13 built on buildvm-05.phx2.fedoraproject.org
> Windowing system distributor 'Fedora Project', version 11.0.11803000

Do you see this with 25.2-rc1 on GNU/Linux though?

There *was* a change since 25.1 (although supposedly that only
affected python 3). Do you have "set colored-stats on" in your
~/.inputrc? There was a report in #24401 of that causing trouble.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

Message received at 25753 <at> debbugs.gnu.org:

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From: Live System User <nyc4bos@HIDDEN>
To: npostavs@HIDDEN
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
In-Reply-To: <87poifjsw2.fsf@HIDDEN>
 (npostavs@HIDDEN's message of "Sat, 18 Feb 2017
 12:44:29 -0500")
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
 <87poifjsw2.fsf@HIDDEN>
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npostavs@HIDDEN writes:

> Eli Zaretskii <eliz@HIDDEN> writes:
>
>>> From: charles@HIDDEN (Charles A. Roelli)
>>> Date: Thu, 16 Feb 2017 17:07:48 +0100
>>>=20
>>> In emacs 25.2 (rc1) and 25.1, interaction with the Python shell does not
>>> seem to be working fully.  Python version is '2.7.12 (v2.7.12:d33e0cf91=
556,
>>> Jun 26 2016, 12:10:39) [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)]', and
>>> this is on Snow Leopard.
>>
>> Please try the next RC (should be out in a few days), I think we fixed
>> that there.
>
> AFAIK, the only change since rc1 is to add "ipython" to
> python-shell-completion-native-disabled-interpreters.  And that should
> not affect the problem reported here, which does not seem to involve
> ipython.
>
> It might be something macOS specific, because I don't see any problems
> on Arch GNU/Linux with python 2.7.13.

  I see the problem on GNU/Linux (Fedora):

Warning (python): Your =E2=80=98python-shell-interpreter=E2=80=99 doesn=E2=
=80=99t seem to
support readline, yet =E2=80=98python-shell-completion-native=E2=80=99 was =
t and
"python" is not part of the
=E2=80=98python-shell-completion-native-disabled-interpreters=E2=80=99 list=
.  Native
completions have been disabled locally.

Python 2.7.13 (default, Jan 13 2017, 10:15:16)=20
[GCC 6.3.1 20161221 (Red Hat 6.3.1-1)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> python.el: native completion setup loaded

>>> q<TAB>qu<TAB>
Click on a completion to select it.
In this buffer, type RET to select the completion near point.

Possible completions are:
quit
quopri


In GNU Emacs 25.1.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.20.9)
 of 2016-10-13 built on buildvm-05.phx2.fedoraproject.org
Windowing system distributor 'Fedora Project', version 11.0.11803000

  Thanks.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

Message received at 25753 <at> debbugs.gnu.org:

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From: npostavs@HIDDEN
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#25753: 25.2; Python mode shell interaction not working 100%
References: <m27f4qyv8r.fsf@HIDDEN> <83lgt6xbr0.fsf@HIDDEN>
Date: Sat, 18 Feb 2017 12:44:29 -0500
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Eli Zaretskii <eliz@HIDDEN> writes:

>> From: charles@HIDDEN (Charles A. Roelli)
>> Date: Thu, 16 Feb 2017 17:07:48 +0100
>> 
>> In emacs 25.2 (rc1) and 25.1, interaction with the Python shell does not
>> seem to be working fully.  Python version is '2.7.12 (v2.7.12:d33e0cf91556,
>> Jun 26 2016, 12:10:39) [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)]', and
>> this is on Snow Leopard.
>
> Please try the next RC (should be out in a few days), I think we fixed
> that there.

AFAIK, the only change since rc1 is to add "ipython" to
python-shell-completion-native-disabled-interpreters.  And that should
not affect the problem reported here, which does not seem to involve
ipython.

It might be something macOS specific, because I don't see any problems
on Arch GNU/Linux with python 2.7.13.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

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> From: charles@HIDDEN (Charles A. Roelli)
> Date: Thu, 16 Feb 2017 17:07:48 +0100
> 
> In emacs 25.2 (rc1) and 25.1, interaction with the Python shell does not
> seem to be working fully.  Python version is '2.7.12 (v2.7.12:d33e0cf91556,
> Jun 26 2016, 12:10:39) [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)]', and
> this is on Snow Leopard.

Please try the next RC (should be out in a few days), I think we fixed
that there.

Thanks.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

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Subject: 25.2; Python mode shell interaction not working 100%
Date: Thu, 16 Feb 2017 17:07:48 +0100
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In emacs 25.2 (rc1) and 25.1, interaction with the Python shell does not
seem to be working fully.  Python version is '2.7.12 (v2.7.12:d33e0cf91556,
Jun 26 2016, 12:10:39) [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)]', and
this is on Snow Leopard.

- emacs -Q
- open any Python file
- M-x run-python, and this pops up:

  Warning (python): Your =E2=80=98python-shell-interpreter=E2=80=99 doesn=
=E2=80=99t seem to
  support readline, yet =E2=80=98python-shell-completion-native=E2=80=99 wa=
s t and
  "python" is not part of the
  =E2=80=98python-shell-completion-native-disabled-interpreters=E2=80=99 li=
st.  Native
  completions have been disabled locally.
=20=20
  [and yet `import readline, rlcompleter' works fine for me]

- quit that warning, and the *Python* shell states "python.el: native
  completion setup loaded".
- test out completion in the shell, it seems to be working okay
  (`import sys RET sys . TAB' shows the attributes of `sys').  Not sure
  if this is `native' completion though.
- switch to the Python file.  Place point over a module, global
  variable, function, or function definition, and this pops up in the
  echo area (meant to be eldoc documentation, I think):

  import codecs, os;
  __pyfile =3D codecs.open('''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-=
Tmp-/py1883fcQ''',encoding=3D'''utf-8''');
  __code =3D __pyfile.read().encode('''utf-8''');
  __pyfile.close();
  os.remove('''/var/folders/WP/WPe0Q1iAGc0J7iI6J50jcU+++TI/-Tmp-/py1883fcQ'=
'');
  exec(compile(__code,'''/path/to/python/buffer/here''','exec'));
=20=20
  [some line breaks included for readability]

  The same sort of thing is returned by calling, say,
  `(python-ffap-module-path "twisted")'.  Any pointers on fixing this?




In GNU Emacs 25.2.1 (x86_64-apple-darwin10.8.0, NS appkit-1038.36 Version 1=
0.6.8 (Build 10K549))
 of 2017-02-07 built on gray
Windowing system distributor 'Apple', version 10.3.1038
Configured using:
 'configure --with-modules'

Configured features:
JPEG RSVG NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS MODULES

Acknowledgement sent to charles@HIDDEN (Charles A. Roelli):
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.

Report forwarded to bug-gnu-emacs@HIDDEN:
bug#25753; Package emacs. Full text available.

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