Declare your field as:

 Field("price", "double", represent = lambda f, r: r.price if r.price != 
None else " ")

Here represent is a function that will format the field's value and takes 
the field itself and the row as arguments.

To display the table.

def index():
    table = SQLTABLE(db(db.mytable).select())
    return locals()


-- 
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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