from bs4 import BeautifulSoup

parsed = BeautifulSoup('<div><span jsname="566516">Blah Blahs</span></div>', 'lxml')
for element in parsed.find_all("div"):
    for span in element.find_all("span"):
        try:
            span['jsname']
            print(span)
        except KeyError:
            print("no Span")
            pass