[Newbie Q on String & List Manipulation]

[wes weston]

Matthew wrote:
> Hello All,
> 
>     today is the first day i try to programming in Python,
>     my assignment is, write a silly script that probably
>     will run a few times a day to check if the Gmail services
>     is ready or not. ;)
> 
>     however, i encountered some problem when playing with the
>     list and string.
> 
>     i'm using Python 2.2.2 on Redhat. if i write something like:
> 
>         a = "one"
>         b = "two"
>         a += b
>         print a
> 
>     i will get:
> 
>         onetwo
> 
>     ok, seems quite ok, however, not sure why it doesn't work on
>     my silly Gmail script (pls refer to my script belows):
> 
>         for item in thecookies:
>             mycookies += item
> 
>         print mycookies
> 
>     i have exactly 4 items in the "thecookies" list, however, when
>     printing out "mycookies", it just show the last item (in fact,
>     seems the 4 items have been overlapped each others).
> 
>     could somebody pls kindly take a look at my silly script and
>     gimme some advise?
> 
>     thanks very much in advance! :)
> 
> ---
> matthew
> 
> 
> 
> 
> import re
> import string
> import sys
> import urllib
> 
> user = "da at email.address"
> pswd = "dapassword"
> 
> schm = "https://"
> host = "www.google.com"
> path = "/accounts/ServiceLoginBoxAuth"
> qstr = {"service"  : "mail",                     \
>         "continue" : "http://gmail.google.com/", \
>         "Email"    : user,                       \
>         "Passwd"   : pswd}
> 
> qstr = urllib.urlencode(qstr)
> 
> url  = schm + host + path + "?" + qstr
> 
> conn = urllib.urlopen(url)
> 
> headers  = conn.info().headers
> response = conn.read()
> 
> thecookies = []
> 
> #
> # extract all the Set-Cookie from the HTTP response header and put it in thecookies
> #
> 
> for header in headers:
>         matches = re.compile("^Set-Cookie: (.*)$").search(header)
>         if matches:
>                 thecookies.append(matches.group(1))
> 
> #
> # make sure we've grep the SID or die
> #
> 
> foundsessionid = 0
> 
> for item in thecookies:
>         if re.compile("^SID").search(item):
>                 foundsessionid = 1
>                 break
> 
> if not foundsessionid:
>         print "> Failded to retrieve the \"SID\" cookie"
>         sys.exit()
> 
> #
> # grep the GV cookie from the HTTP response or die
> #
> 
> matches = re.compile("^\s*var cookieVal= \"(.*)\";.*", re.M).search(response)
> 
> if matches:
>         thecookies.append("GV=" + matches.group(1))
> else:
>         print "> Failed to retrieve the \"GV\" cookie"
>         sys.exit()
> 
> print thecookies
> 
> mycookies = ""
> 
> for item in thecookies:
>         mycookies += item
> 
> print mycookies
> 
> #
> # still got many things to do right here...
> #
> 
> sys.exit()

 >>> sum=""
 >>> list=["a","b","c","d"]
 >>> for x in list:
...     sum+=x
...
 >>> sum
'abcd'