bug#18796: 24.4; python indent-for-tab-command fails to recognize if-elif-else

[Carlos Pita]

While in python-mode select the following code and press tab:

def f():
    if True:
        pass
    else:
        pass

You will get:

def f():
    if True:
        pass
else:
    pass


Which is clearly wrong. I understand that auto-indenting python could be
a difficult task. Maybe there's a rationale for the above behavior I
can't grasp. But the result is somewhat surprising for the unaware.

-------------------------

In GNU Emacs 24.4.1 (i686-pc-linux-gnu, GTK+ Version 3.12.2)
 of 2014-10-22 on carlos
Windowing system distributor `The X.Org Foundation', version 11.0.11502000
Configured using:
 `configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --with-x-toolkit=gtk3 --with-xft
 'CFLAGS=-march=i686 -mtune=generic -O2 -pipe -fstack-protector-strong
 --param=ssp-buffer-size=4' CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro'

Important settings:
  value of $LC_COLLATE: C
  value of $LC_TIME: es_AR.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Python

Minor modes in effect:
  show-paren-mode: t
  shell-dirtrack-mode: t
  eldoc-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  ido-ubiquitous-mode: t
  ido-everywhere: t
  winner-mode: t
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<up> <up> C-e <return> <backspace> e l s e : <return> 
0 <return> <return> <up> <up> <up> <up> <up> C-a <down> 
<up> C-SPC <down> <down> <down> <down> <tab> <up> <up> 
C-SPC <down> <down> <down> <down> C-w <down> C-x C-s 
<down> <down> C-h f i n d e n t - f o r <right> <return> 
<down> <down> <down> <down> <up> <up> <up> <down> <down> 
q <down> <down> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <down> <down> <down> <down> SPC SPC SPC <down> 
SPC SPC <up> <up> <up> <down> <down> <delete> <up> 
<up> <down> <down> <left> <delete> <delete> <down> 
<tab> <up> <up> <up> C-a C-SPC <down> <down> <down> 
<down> <tab> C-/ <up> <up> <up> <up> <up> <up> <return> 
<return> <up> <up> i f SPC T r u e : C-a C-d C-k i 
f SPC T r u e : <tab> <tab> <tab> <tab> <tab> <tab> 
<down> <down> <down> <down> C-a C-SPC <down> <down> 
<down> <down> <tab> <tab> C-/ C-/ <up> <up> <up> <up> 
<up> <up> <up> <tab> p a s s <return> e l s e <return> 
SPC SPC SPC SPC p a s s <up> <up> <up> <tab> C-/ C-a 
C-SPC <down> <down> <down> <down> <tab> <up> <up> C-e 
: <down> <tab> <up> <up> <up> C-a C-SPC <down> <down> 
<down> <down> <tab> <up> <up> <up> <up> <up> <return> 
d e <backspace> <backspace> <backspace> <backspace> 
d e f SPC x x x x ( ) : <return> <up> M-d d <down> 
<up> <backspace> f <down> <backspace> <backspace> <down> 
C-a C-SPC <down> <down> <down> <down> <tab> <up> <up> 
<tab> <down> <tab> <up> <up> <up> <up> C-a C-SPC <down> 
<down> <down> <down> <down> <tab> C-/ <up> <up> <up> 
<up> <up> C-SPC <down> <down> <down> <down> <down> 
M-w <down> M-x r e p o r t - e m <tab> <return>

Recent messages:
Mark activated
Closes elif argv[1] == "send":
Undo! [3 times]
Mark set
Closes if True:
Mark activated [2 times]
Closes if True:
Mark set
Undo!
Mark activated

Load-path shadows:
~/.emacs.d/lisp/rmail hides /usr/share/emacs/24.4/lisp/mail/rmail

Features:
(nnir qp gnus-dup mule-util debug misearch multi-isearch jka-compr
oauth2 warnings plstore cus-edit cus-start cus-load eieio-opt speedbar
sb-image ezimage dframe python json tramp-cache tramp tramp-compat
tramp-loaddefs trampver mailalias smtpmail pp shadow emacsbug sendmail
rect url-queue timezone shr-color color url-http url-gw url-auth eww
mm-url shr sort smiley gnus-cite mail-extr gnus-async gnus-bcklg gnus-ml
disp-table gnus-topic nndraft nnmh nnfolder utf-7 gnutls network-stream
starttls nnimap parse-time tls utf7 netrc gnus-agent gnus-srvr
gnus-score score-mode nnvirtual gnus-msg nntp gnus-cache
google-contacts-gnus gnus-art mm-uu mml2015 mm-view mml-smime smime dig
gnus-sum nnoo gnus-group gnus-undo nnmail mail-source
google-contacts-message google-contacts xml url-cache url url-proxy
url-privacy url-expand url-methods url-history url-cookie url-domsuf
mailcap url-util url-parse auth-source eieio byte-opt bytecomp
byte-compile cconv eieio-core password-cache url-vars google-oauth
gnus-start gnus-spec gnus-int gnus-range message idna rfc822 mml mml-sec
mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mailabbrev gmm-utils mailheader gnus-win gnus gnus-ems
nnheader gnus-util mail-utils mm-util mail-prsvr wid-edit vc-git
epa-file epa derived epg server paredit edmacro kmacro paren cl-macs
ob-python ob-R org org-macro org-footnote org-pcomplete org-list
org-faces org-entities noutline outline easy-mmode org-version
ob-emacs-lisp ob ob-tangle ob-ref ob-lob ob-table ob-exp org-src ob-keys
ob-comint ob-core ob-eval org-compat org-macs org-loaddefs find-func
cal-menu calendar cal-loaddefs ess-toolbar ess-mouse mouseme thingatpt
browse-url ess-menu ess-swv ess-noweb ess-noweb-font-lock-mode
ess-bugs-l essd-els ess-sas-d ess-sas-l ess-sas-a shell pcomplete
ess-sta-d ess-sta-l cc-vars cc-defs make-regexp ess-sp6-d ess-sp3-d
ess-julia ess-r-d compile ess-tracebug format-spec ess-roxy hideshow
ess-help ess-developer ess-r-args eldoc ess-s-l ess ess-inf comint
ansi-color ess-mode ess-noweb-mode ess-utils time-date ess-custom
executable ess-compat ess-site yasnippet help-mode cl gv ido-ubiquitous
cl-loaddefs cl-lib advice help-fns imenu-anywhere imenu ido windmove
winner ring info easymenu package epg-config wombat-theme tooltip
electric uniquify ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
lisp-mode prog-mode register page menu-bar rfn-eshadow timer select
scroll-bar 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 minibuffer nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
dbusbind gfilenotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:
((conses 8 557759 103077)
 (symbols 24 46775 0)
 (miscs 20 5488 3171)
 (strings 16 166668 3684)
 (string-bytes 1 4655761)
 (vectors 8 48281)
 (vector-slots 4 1634972 78634)
 (floats 8 1011 1185)
 (intervals 28 21468 2483)
 (buffers 512 63)
 (heap 1024 81411 3306))