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bug#25753: 25.2; Python mode shell interaction not working 100%
From: |
Charles A. Roelli |
Subject: |
bug#25753: 25.2; Python mode shell interaction not working 100% |
Date: |
Sat, 25 Feb 2017 23:28:12 +0100 |
On Sat, Feb 25 2017 at 09:34:10 am, npostavs@users.sourceforge.net wrote:
> charles@aurox.ch (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
- bug#25753: 25.2; Python mode shell interaction not working 100%, (continued)
- bug#25753: 25.2; Python mode shell interaction not working 100%, npostavs, 2017/02/21
- bug#25753: 25.2; Python mode shell interaction not working 100%, Charles A. Roelli, 2017/02/22
- bug#25753: 25.2; Python mode shell interaction not working 100%, npostavs, 2017/02/23
- bug#25753: 25.2; Python mode shell interaction not working 100%, Charles A. Roelli, 2017/02/24
- bug#25753: 25.2; Python mode shell interaction not working 100%, Charles A. Roelli, 2017/02/25
- bug#25753: 25.2; Python mode shell interaction not working 100%, npostavs, 2017/02/25
- bug#25753: 25.2; Python mode shell interaction not working 100%,
Charles A. Roelli <=
- bug#25753: 25.2; Python mode shell interaction not working 100%, npostavs, 2017/02/26
- bug#25753: 25.2; Python mode shell interaction not working 100%, Charles A. Roelli, 2017/02/28
- bug#25753: 25.2; Python mode shell interaction not working 100%, npostavs, 2017/02/28
- bug#25753: 25.2; Python mode shell interaction not working 100%, Eli Zaretskii, 2017/02/28