Using BeautifulSoup, how to guard against elements not being found?

Question

I am looping through table rows in a table, but the first 1 or 2 rows doesn\'t have the elements I am looking for (they are for table column headers etc.).

So after

Answer 1

Starting from tr:

for td in tr.findChildren('td'):
    img = td.findChild('img')
    if img:
        src = img.get('src', '')  # return a blank string if there's no src attribute
        if src:
            # do something with src