ianh@dhalsim:~/temp/html5/html5lib$ ./parse.py "test" Traceback (most recent call last): File "./parse.py", line 126, in ? parse() File "./parse.py", line 87, in parse document = p.parse(f) File "/home/.hardangervidda/ianh/temp/html5/html5lib/src/html5parser.py", line 118, in parse self.phase.processEOF() File "/home/.hardangervidda/ianh/temp/html5/html5lib/src/html5parser.py", line 232, in processEOF self.tree.generateImpliedEndTags() File "/home/.hardangervidda/ianh/temp/html5/html5lib/src/treebuilders/_base.py", line 297, in generateImpliedEndTags if (name in frozenset(("dd", "dt", "li", "p", "td", "th", "tr")) NameError: global name 'frozenset' is not defined