[Zope] Using fmt to format

[Peter Bengtsson]

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This works: <dtml-var amount fmt="%.2f">

But suppose I go:
<dtml-let amountformat="'%.2f'">
     This doesn't work: <dtml-var amount fmt=amountformat>
     Nor this: <dtml-var amount fmt="amountformat">
</dtml-let>

I just get
Error Type: TypeError
Error Value: not all arguments converted


With a dateobject it's easier thanks to the strftime() method of any date 
object.
What about strings, ints and floats in DTML??

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