Here is a quick and dirty (by fully functional) sample of updating a listpage/listitem in Google Sites using the Data API.
#!/usr/bin/python import getpass import gdata.sites.client import gdata.sites.data USER = 'test@example.com' SITE = 'YOUR_SITE_NAME' DOMAIN = 'YOUR_DOMAIN' # or 'site' if you're not using a Google Apps domain. # Setup our client. client = gdata.sites.client.SitesClient(source='google-SitesListeItemUpdateTest', site=SITE, domain=DOMAIN) client.ClientLogin(USER, getpass.getpass(), client.source) client.ssl = True client.http_client.debug = False # Only fetch listpages. feed = client.GetContentFeed(uri=client.MakeContentFeedUri() + '?kind=listpage') # Work with first listpage we found. lp = feed.GetListPages()[0] print 'Listpage columns:' for col in lp.data.column: print 'index: %s, name: %s' % (col.index, col.name) # Query the listpage's listems and work with first row found. li = client.GetContentFeed(uri=lp.feed_link.href).entry[0] print 'Row contents:' for field in li.field: print 'index: %s, name: %s, value: %s' % (field.index, field.name, field.text) # Update the first fields/column's value. li.field[0].text = 'Someone else' entry = client.Update(li) # Update the listpage's column heading. #lp.data.column[0].name = 'New Heading' #entry2 = client.Update(lp)