How can I check attribute existings by Elementtree?

Question

I need to check certain attributes for existence. Like:

if "blah-blah-blah" is None:
    print "there is no such attribute"
else:
    print "The attribute exists"

Answer 1

Element objects have all the attributes in the attrib dict.

if 'blah' not in elem.attrib:
   print "there is no such attribute"