Problem checking an existing browser cookie

[Nik the Greek]

On 30 Αύγ, 19:41, MRAB <pyt... at mrabarnett.plus.com> wrote:
> On 30/08/2010 04:33, Nik the Greek wrote:
>
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> > On 30 Αύγ, 06:12, MRAB<pyt... at mrabarnett.plus.com>  wrote:
>
> >> This part:
>
> >>       ( not mycookie or mycookie.value != 'nikos' )
>
> >> is false but this part:
>
> >>       re.search( r'(msn|yandex|13448|spider|crawl)', host ) is None
>
> >> is true because host doesn't contain any of those substrings.
>
> > So, the if code does executed because one of the condition is true?
>
> > How should i write it?
>
> > I cannot think clearly on this at all.
>
> > I just wan to tell it to get executed  ONLY IF
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> > the cookie values is not 'nikos'
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> > or ( don't knwo if i have to use and or 'or' here)
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> > host does not contain any of the substrings.
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> > What am i doign wrong?!
>
> It might be clearer if you reverse the condition and say:
>
>      me_visiting = ...
>      if not me_visiting:
>          ...


# initialize cookie
cookie = SimpleCookie()
cookie.load( os.environ.get('HTTP_COOKIE', '') )
visitor = cookie.get('visitor')

This statement

if (visitor.value != 'nikos') and re.search( r'(msn|yandex|13448|
spider|crawl)', host ) is None:

produces the following error:

 /home/webville/public_html/cgi-bin/counter.py
   93 # do not increment the counter if a Cookie is set to the
visitors browser already
   94 #
=================================================================================================================
   95 if (visitor.value != 'nikos') and re.search( r'(msn|yandex|13448|
spider|crawl)', host ) is None:
   96
   97         print visitor
visitor = None, visitor.value undefined, re = <module 're' from '/usr/
lib64/python2.4/re.pyc'>, re.search = <function search>, host =
'178-128-217.dynamic.cyta.gr', builtin None = None

Why visitor.value is undefined?