Here is what I get back from this Python line of code
listm = soup.findAll(\'td\',{\'class\':\'thumb\'})
when I iterate over the listm, her
Your td elements contain some nested elements; search for the img tag within each td element, then take the alt attribute with an item lookup:
td
img
alt
for td in listm: img = td.find('img') if img is not None: print img['alt']