Preventing nose from finding setup.py

[Roy Smith]

We've got a package (with an empty __init__.py), which contains a 
setup.py file.  When I run nosetests, the test discovery code finds 
setup.py, thinks it's a test, and tries to run it (with predictably poor 
results).

Is there some way to mark this file as not a test? If it was a method in 
a file, I would decorate it with @nottest, but that doesn't work here.