On Thu, 01 Nov 2012, Andreas Roehler wrote:

> Am 01.11.2012 19:34, schrieb Yaroslav Halchenko:
> > well -- for me, in that instance of emacs (with bulk of other things
> > loaded) it happens with any file, e.g.

> > print "HELLO"

> > I now tried to start with an absent .emacs and then load
> > python-mode.el and then such a rudimentary 1.py -- now getting "File
> > mode ..." error and C-c C-c doesn't work at all due to "let: Wrong type
> > argument: stringp, nil" :-/

> > Loading /home/yoh/deb/gits/python-mode.bzr2/python-mode.el
> > (source)...done
> > File mode specification error: (wrong-type-argument stringp nil)

> > :-/


> strange..

> maybe lets try the following.

> emacs -Q
> load python-mode.el
> load your example.py

got

File mode specification error: (wrong-type-argument stringp nil)

upon loading 1.py

> C-c C-c

The same

> M-x report-emacs-bug
> please send the output then


In GNU Emacs 23.4.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.10)
 of 2012-04-07 on trouble, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11203000
configured using `configure  '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var/lib' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.4/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.4/site-lisp:/usr/share/emacs/site-lisp' '--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -Wall -DDEBIAN -O2' 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: en_US.UTF-8
  value of $LC_CTYPE: en_US.UTF-8
  value of $LC_MESSAGES: en_US.UTF-8
  value of $LC_MONETARY: ru_RU.UTF-8
  value of $LC_NUMERIC: ru_RU.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Py

Minor modes in effect:
  shell-dirtrack-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-x l o a d - l i v <backspace> b r <tab> <return> 
<help-echo> <S-insert> <return> C-x C-f / t m p / 1 
. p y <return> C-x 2 C-x o C-x b <return> C-x b * M 
e <tab> <return> <help-echo> <down-mouse-1> <mouse-movement> 
<mouse-movement> <drag-mouse-1> <help-echo> <down-mouse-1> 
<mouse-1> C-c C-c <help-echo> M-x r e p o r t - e m 
<tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Loading /home/yoh/deb/gits/python-mode.bzr2/python-mode.el (source)...done
File mode specification error: (wrong-type-argument stringp nil)
let: Wrong type argument: stringp, nil

Load-path shadows:
/usr/share/emacs/23.4/site-lisp/cscope/xcscope hides /usr/share/emacs/site-lisp/xcscope
/usr/share/emacs/23.4/site-lisp/cmake-data/cmake-mode hides /usr/share/emacs/site-lisp/cmake-mode
/usr/share/emacs/23.4/site-lisp/debian-startup hides /usr/share/emacs/site-lisp/debian-startup
/usr/share/emacs/23.4/site-lisp/artist hides /usr/share/emacs/site-lisp/artist
/usr/share/emacs/23.4/site-lisp/dictionaries-common/ispell hides /usr/share/emacs/23.4/lisp/textmodes/ispell
/usr/share/emacs/23.4/site-lisp/dictionaries-common/flyspell hides /usr/share/emacs/23.4/lisp/textmodes/flyspell
/usr/share/emacs/23.4/site-lisp/artist hides /usr/share/emacs/23.4/lisp/textmodes/artist
/usr/share/emacs/site-lisp/rst hides /usr/share/emacs/23.4/lisp/textmodes/rst
/usr/share/emacs/23.4/site-lisp/org-mode/org-ascii hides /usr/share/emacs/23.4/lisp/org/org-ascii
/usr/share/emacs/23.4/site-lisp/org-mode/org-footnote hides /usr/share/emacs/23.4/lisp/org/org-footnote
/usr/share/emacs/23.4/site-lisp/org-mode/org-clock hides /usr/share/emacs/23.4/lisp/org/org-clock
/usr/share/emacs/23.4/site-lisp/org-mode/org-id hides /usr/share/emacs/23.4/lisp/org/org-id
/usr/share/emacs/23.4/site-lisp/org-mode/org-indent hides /usr/share/emacs/23.4/lisp/org/org-indent
/usr/share/emacs/23.4/site-lisp/org-mode/org-plot hides /usr/share/emacs/23.4/lisp/org/org-plot
/usr/share/emacs/23.4/site-lisp/org-mode/org-docbook hides /usr/share/emacs/23.4/lisp/org/org-docbook
/usr/share/emacs/23.4/site-lisp/org-mode/org-inlinetask hides /usr/share/emacs/23.4/lisp/org/org-inlinetask
/usr/share/emacs/23.4/site-lisp/org-mode/org-datetree hides /usr/share/emacs/23.4/lisp/org/org-datetree
/usr/share/emacs/23.4/site-lisp/org-mode/org-feed hides /usr/share/emacs/23.4/lisp/org/org-feed
/usr/share/emacs/23.4/site-lisp/org-mode/org-archive hides /usr/share/emacs/23.4/lisp/org/org-archive
/usr/share/emacs/23.4/site-lisp/org-mode/org-src hides /usr/share/emacs/23.4/lisp/org/org-src
/usr/share/emacs/23.4/site-lisp/org-mode/org-jsinfo hides /usr/share/emacs/23.4/lisp/org/org-jsinfo
/usr/share/emacs/23.4/site-lisp/org-mode/org-wl hides /usr/share/emacs/23.4/lisp/org/org-wl
/usr/share/emacs/23.4/site-lisp/org-mode/org-table hides /usr/share/emacs/23.4/lisp/org/org-table
/usr/share/emacs/23.4/site-lisp/org-mode/org-compat hides /usr/share/emacs/23.4/lisp/org/org-compat
/usr/share/emacs/23.4/site-lisp/org-mode/org-macs hides /usr/share/emacs/23.4/lisp/org/org-macs
/usr/share/emacs/23.4/site-lisp/org-mode/org-agenda hides /usr/share/emacs/23.4/lisp/org/org-agenda
/usr/share/emacs/23.4/site-lisp/org-mode/org-install hides /usr/share/emacs/23.4/lisp/org/org-install
/usr/share/emacs/23.4/site-lisp/org-mode/org-exp-blocks hides /usr/share/emacs/23.4/lisp/org/org-exp-blocks
/usr/share/emacs/23.4/site-lisp/org-mode/org-attach hides /usr/share/emacs/23.4/lisp/org/org-attach
/usr/share/emacs/23.4/site-lisp/org-mode/org-protocol hides /usr/share/emacs/23.4/lisp/org/org-protocol
/usr/share/emacs/23.4/site-lisp/org-mode/org-info hides /usr/share/emacs/23.4/lisp/org/org-info
/usr/share/emacs/23.4/site-lisp/org-mode/org-timer hides /usr/share/emacs/23.4/lisp/org/org-timer
/usr/share/emacs/23.4/site-lisp/org-mode/org-vm hides /usr/share/emacs/23.4/lisp/org/org-vm
/usr/share/emacs/23.4/site-lisp/org-mode/org-xoxo hides /usr/share/emacs/23.4/lisp/org/org-xoxo
/usr/share/emacs/23.4/site-lisp/org-mode/org-habit hides /usr/share/emacs/23.4/lisp/org/org-habit
/usr/share/emacs/23.4/site-lisp/org-mode/org hides /usr/share/emacs/23.4/lisp/org/org
/usr/share/emacs/23.4/site-lisp/org-mode/org-crypt hides /usr/share/emacs/23.4/lisp/org/org-crypt
/usr/share/emacs/23.4/site-lisp/org-mode/org-remember hides /usr/share/emacs/23.4/lisp/org/org-remember
/usr/share/emacs/23.4/site-lisp/org-mode/org-icalendar hides /usr/share/emacs/23.4/lisp/org/org-icalendar
/usr/share/emacs/23.4/site-lisp/org-mode/org-latex hides /usr/share/emacs/23.4/lisp/org/org-latex
/usr/share/emacs/23.4/site-lisp/org-mode/org-irc hides /usr/share/emacs/23.4/lisp/org/org-irc
/usr/share/emacs/23.4/site-lisp/org-mode/org-faces hides /usr/share/emacs/23.4/lisp/org/org-faces
/usr/share/emacs/23.4/site-lisp/org-mode/org-bibtex hides /usr/share/emacs/23.4/lisp/org/org-bibtex
/usr/share/emacs/23.4/site-lisp/org-mode/org-exp hides /usr/share/emacs/23.4/lisp/org/org-exp
/usr/share/emacs/23.4/site-lisp/org-mode/org-gnus hides /usr/share/emacs/23.4/lisp/org/org-gnus
/usr/share/emacs/23.4/site-lisp/org-mode/org-mew hides /usr/share/emacs/23.4/lisp/org/org-mew
/usr/share/emacs/23.4/site-lisp/org-mode/org-html hides /usr/share/emacs/23.4/lisp/org/org-html
/usr/share/emacs/23.4/site-lisp/org-mode/org-rmail hides /usr/share/emacs/23.4/lisp/org/org-rmail
/usr/share/emacs/23.4/site-lisp/org-mode/org-w3m hides /usr/share/emacs/23.4/lisp/org/org-w3m
/usr/share/emacs/23.4/site-lisp/org-mode/org-mhe hides /usr/share/emacs/23.4/lisp/org/org-mhe
/usr/share/emacs/23.4/site-lisp/org-mode/org-mac-message hides /usr/share/emacs/23.4/lisp/org/org-mac-message
/usr/share/emacs/23.4/site-lisp/org-mode/org-list hides /usr/share/emacs/23.4/lisp/org/org-list
/usr/share/emacs/23.4/site-lisp/org-mode/org-mouse hides /usr/share/emacs/23.4/lisp/org/org-mouse
/usr/share/emacs/23.4/site-lisp/org-mode/org-bbdb hides /usr/share/emacs/23.4/lisp/org/org-bbdb
/usr/share/emacs/23.4/site-lisp/org-mode/org-publish hides /usr/share/emacs/23.4/lisp/org/org-publish
/usr/share/emacs/23.4/site-lisp/org-mode/org-colview hides /usr/share/emacs/23.4/lisp/org/org-colview
/usr/share/emacs/23.4/site-lisp/org-mode/org-mobile hides /usr/share/emacs/23.4/lisp/org/org-mobile
/usr/share/emacs/23.4/site-lisp/org-mode/org-freemind hides /usr/share/emacs/23.4/lisp/org/org-freemind

Features:
(shadow sort mail-extr message sendmail ecomplete rfc822 mml mml-sec
password-cache mm-decode mm-bodies mm-encode mailcap mail-parse rfc2231
rfc2047 rfc2045 qp ietf-drums mailabbrev nnheader gnus-util netrc
time-date mm-util mail-prsvr gmm-utils wid-edit mailheader canlock sha1
hex-util hashcash mail-utils emacsbug python-mode python derived
skeleton advice help-fns advice-preload easymenu edmacro kmacro
thingatpt imenu flymake rx shell cc-cmds cc-engine cc-vars cc-defs
regexp-opt ansi-color compile cl cl-19 comint ring tooltip ediff-hook
vc-hooks lisp-float-type mwheel x-win x-dnd font-setting tool-bar dnd
fontset image fringe lisp-mode register page menu-bar rfn-eshadow timer
select scroll-bar mldrag mouse jit-lock font-lock syntax facemenu
font-core frame cham georgian utf-8-lang misc-lang vietnamese tibetan
thai tai-viet lao korean japanese hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese case-table epa-hook
jka-cmpr-hook help simple abbrev loaddefs button minibuffer faces
cus-face files text-properties overlay md5 base64 format env code-pages
mule custom widget hashtable-print-readable backquote
make-network-process dbusbind system-font-setting font-render-setting
gtk x-toolkit x multi-tty emacs)

-- 
Yaroslav O. Halchenko
Postdoctoral Fellow,   Department of Psychological and Brain Sciences
Dartmouth College, 419 Moore Hall, Hinman Box 6207, Hanover, NH 03755
Phone: +1 (603) 646-9834                       Fax: +1 (603) 646-1419
WWW:   http://www.linkedin.com/in/yarik