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No omnicompletion for python class members in vim?
class A(object):

    def __init__(self):
        self.x = "whatever"    # x will not seen in ctags/omnicompletion!!!

class A(object):

    x = None

    def __init__(self):
        self.x = whatever

$ ctags --version
Exuberant Ctags 5.9~svn20110310, Copyright (C) 1996-2009 Darren Hiebert
  Compiled: Mar 18 2011, 10:38:14

!_TAG_FILE_FORMAT       2       /extended format; --format=1 will not append ;" to lines/
!_TAG_FILE_SORTED       1       /0=unsorted, 1=sorted, 2=foldcase/
!_TAG_PROGRAM_AUTHOR    Darren Hiebert  /dhiebert@users.sourceforge.net/
!_TAG_PROGRAM_NAME      Exuberant Ctags //
!_TAG_PROGRAM_URL       http://ctags.sourceforge.net    /official site/
!_TAG_PROGRAM_VERSION   5.9~svn20110310 //
A       aaa.py  /^class A(object):$/;"  c
__init__        aaa.py  /^   def __init__(self, x):$/;" m       class:A
x       aaa.py  /^   x = None$/;"       v       class:A

ctags -e aaa.py  # where aaa.py - file with code snippet above

M-. x   (enter)
~/TAGS   (enter)