Create to_quantity() method for numerical properties

[morales-gregorio]

Hi!

I have encountered myself doing the following many, many times:

import quantities as pq
myQuantity = pq.Quantity(myOdml.properties['myProp'].value,
                         myOdml.properties['myProp'].unit)

So I wondered this is probably something people would expect odml to do for them. My suggestion would be a method of the property class that apart from doing the above also checks some stuff like:

• If quantities is installed
• If units are specified
• If the units are compatible with quantities units
• If the value is actually numerical
• ...

And returns appropriate warnings/errors when the requirements are not met.

Let me know your thoughts! Aitor