What's wrong?

[root]

from window1Handlers import *
class window1Widget:
    def add_col(co=[]):
        for cc in co:
            print cc
            self.li=GtkListItem('123')
            self.list1.add(self.li)
            self.li.show()

    def download_process(xxxxxx=None):
 print 'now working'
 homedir = '.'
 main_url = 'http://www.findserendipity.com/'
 #main_page = urllib.urlopen(main_url+'collections.html').read()
 main_page = open('cool.html').read()
 mainpars = extract_links(main_page)
 collections = no_doubles(select_html(mainpars.anchorlist))
 self.add_col(collections)         # WHY this is an error? (Name Error:
self)