Partial validation results from an invalid input?

Hi everyone,

Is there a way to get the python values for successful fields in a
Schema when other fields have failed?

For example, suppose I have the following schema and input value:

sch = Schema(fields=dict(x=Int(), y=DateConverter(), z=Int()))
v = dict(x='12', y='1/16/1973', z='foo')

I'd like to validate v against sch in such a way that I get not only
the error message from z, but also the values 12 and datetime(1973, 1,
16) from x and y, respectively.

Is there a way to do this?

None of my use cases rely on chained_validators, so all I need are the
values computed by the fields of the schema.

Thanks,
Dan Lepage

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