It basically has to do with python namespaces. You did not import Rows into 
your current namespace. The definition is there in the context where the 
select rows were created but in your namespace you could have another Rows 
definition that is quite different or none at all. Web2py imports a lot of 
stuff automatically so I can see how that can create confusion when 
something isn't automatically available but that's just the way regular 
python works.

https://code.tutsplus.com/tutorials/what-are-python-namespaces-and-why-are-they-needed--cms-28598

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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