the docstrings api on web2py.com/examples/epydoc are reeeally old and 
buggy. The new api documentation is on readthedocs 
<http://web2py.readthedocs.org/en/latest/>

Now... if you want to pass a StringIO to response.stream, you have to 
"rewind" it to 0 before passing it ....

s = cStringIO.StringIO()
rows.export_to_csv_file(s, represent=False)
s.seek(0)   #<---
return response.stream(s, attachment=True, filename='categories.csv')



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