It's enough to use just a function. However if you want your widget to be 
configurable you could use a function that returns a function for a widget 
and you would make 
widget=function_that_returns_a_function(**my_widget_options). 

Another alternative is to have a class and set class attributes and then 
have a classmethod you put on the widget, this way you don't need an 
instance of the class. Another alternative would be to have a class with a 
__call__ method then you could create an instance and put that on widget.  
   

-- 
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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