bug#27655: 25.2; Lisp nesting exceeds max-lisp-eval-depth in python-mode 6.2.3

bug#27655: 25.2; Lisp nesting exceeds max-lisp-eval-depth in python-mode 6.2.3

[Håkon Hægland]

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Hello. I have this simple Python test program:


#! /usr/bin/env python3
import numpy as np

x = np.array([0, 1, 2, 3])
y = np.array([0, 1, 4, 9])

def gen_segments(x, y):
    for i in range(0, len(x)-1):
        yield (x[i], x[i+1]), (y[i], y[i+1])

lines = [list(zip(s, t)) for s, t in gen_segments(x, y)]



when I position the cursor at the end of the line starting with yield and
press ENTER, Emacs gives me the following error:

"Lisp nesting exceeds ‘max-lisp-eval-depth’"
I am using Emacs version 25.2 on Ubuntu 17.04.

Here is a minimal setup to reproduce the problem:

$ emacs -Q -l init.el t.py

where "t.py" is the above python program, and "init.el" is:


(setq debug-on-error t)
(setq package-load-list '((python-mode t)))
(package-initialize)
(setq package-enable-at-startup nil)


The Python mode that package-initialize above loads was installed with the
Emacs package manager as python-mode-20170307.457 in my elpa directory. If
I comment out the line (package-initialize) above, it works fine (then
Emacs uses the Python mode in
/opt/emacs-25.2/share/emacs/25.2/lisp/progmodes/python.el.gz instead).

Best regards,
Håkon Hægland

-----------
Configured using:
 'configure CFLAGS=-no-pie --with-xft --prefix=/opt/emacs-25.2'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LC_MONETARY: nb_NO.UTF-8
  value of $LC_NUMERIC: nb_NO.UTF-8
  value of $LC_TIME: nb_NO.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

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bug#27655: 25.2; Lisp nesting exceeds max-lisp-eval-depth in python-mode 6.2.3

[Glenn Morris]

Håkon Hægland wrote:

> (setq debug-on-error t)
> (setq package-load-list '((python-mode t)))
> (package-initialize)
> (setq package-enable-at-startup nil)
>
>
> The Python mode that package-initialize above loads was installed with the
> Emacs package manager as python-mode-20170307.457 in my elpa directory. If
> I comment out the line (package-initialize) above, it works fine (then
> Emacs uses the Python mode in
> /opt/emacs-25.2/share/emacs/25.2/lisp/progmodes/python.el.gz instead).

python-mode (as opposed to python.el) is not part of GNU Emacs or GNU Elpa.
So please report this to whoever maintains it, not here.