Colander schema node with the same value as another node?

[Petr Blahos]

Hi,

is it possible to define a schema with a node that will have the same value

as another node in the same Schema? Something along these lines:

class Schema(colander.Schema):

    initial_amount = colander.SchemaNode(colander.Float())

    current_amount = GetValueFrom(src="initial_amount")

Thanks, 

Petr