SyntaxError: invalid syntax blog.py:76: _class="post"

[samtaufa]

Symptom:
install errors with:

byte-compiling /usr/local/lib/python2.5/site-packages/countershape/blog.py to blog.pyc
File "/usr/local/lib/python2.5/site-packages/countershape/blog.py", line 76
return str(html.DIV(*blocks, _class="post"))
^
SyntaxError: invalid syntax

Likewise, when you cshape on doc-src

cshape countershape/doc-src/ /tmp/

Traceback (most recent call last):
File "/usr/local/bin/cshape", line 4, in
import countershape.doc as doc
File "/usr/local/lib/python2.5/site-packages/countershape/init.py", line 5, in
from blog import Post, IndexPage, ArchivePage, RSSPage, Blog
File "/usr/local/lib/python2.5/site-packages/countershape/blog.py", line 76
return str(html.DIV(*blocks, _class="post"))
^
SyntaxError: invalid syntax

pry countershape/test/

Traceback (most recent call last):
File "/usr/local/bin/pry", line 114, in
main()
File "/usr/local/bin/pry", line 93, in main
r.addPath(path or ".", options.recurse)
File "/usr/local/lib/python2.5/site-packages/libpry/test.py", line 882, in addPath
self.addChild(_DirNode(path, self.cover))
File "/usr/local/lib/python2.5/site-packages/libpry/test.py", line 817, in init
self.addChild(_FileNode(self.dirPath, i, self.magic))
File "/usr/local/lib/python2.5/site-packages/libpry/test.py", line 756, in init
m = import(modname)
File "./test_blog.py", line 2, in
import countershape
File "../countershape/init.py", line 5, in
from blog import Post, IndexPage, ArchivePage, RSSPage, Blog
File "../countershape/blog.py", line 76
return str(html.DIV(*blocks, _class="post"))
^
SyntaxError: invalid syntax

OS:
OpenBSD 4.4 patched
Python:
2.5.2