form=cgi.FieldStorage()
cookie=Cookie.SimpleCookie(os.environ["HTTP_COOKIE"])
def get_param(param,default):
    global cookie
    if form.getvalue(param) is not None:
        return form.getvalue(param) # get KB from form
        cookie[param]=form.getvalue(param)# save KB to cookie
    elif cookie[param].value is not None: 
        return cookie[param].value
    else:
        return default # default
kb=get_param("kb","1111")
print "Content-Type: text/html; charset=utf-8"
print cookie
print ""
print kb

Traceback (most recent call last):
  File "index.py", line 15, in <module>
    cookie=Cookie.SimpleCookie(os.environ["HTTP_COOKIE"])
  File "/usr/lib/python2.7/UserDict.py", line 23, in __getitem__
    raise KeyError(key)
KeyError: 'HTTP_COOKIE'