23.0.0; "Symbol's value as variable is void: py-mode-map"

[Guilherme Mesquita Gondim]

When I run `python-mode' appears this message:

    run-hooks: Symbol's value as variable is void: py-mode-map


In GNU Emacs 23.0.0.1 (i486-pc-linux-gnu, GTK+ Version 2.12.0)
 of 2007-10-01 on samarium
 (emacs-snapshot package, version 1:20070928-1~gutsy)
Windowing system distributor `The X.Org Foundation', version 11.0.10300000
configured using `configure  '--build' 'i486-linux-gnu' '--host' 
'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' 
'--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info' 
'--mandir=/usr/share/man' '--with-pop=yes' 
'--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.0/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.0/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.0.0/leim'
 '--with-x=yes' '--with-x-toolkit=gtk' '--enable-font-backend' '--with-xft' 
'--with-freetype' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 
'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2''

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

Major mode: Python

Minor modes in effect:
  show-paren-mode: t
  savehist-mode: t
  global-hl-line-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-x p y <tab> t h <tab> <return> <help-echo> <down-mouse-1> 
<mouse-1> <help-echo> M-x r e p o r <tab> <return>

Recent messages:
For information about the GNU system and GNU/Linux, type C-h C-p.
Making completion list...
Loading help-mode...done
Loading python...
Loading easymenu...done
Loading python...done
run-hooks: Symbol's value as variable is void: py-mode-map
Loading emacsbug...
Loading regexp-opt...done
Loading emacsbug...done