Renaming fields using a Schema

I'm using a FormEncode Schema to validate a dictionary, and I was
wondering if it would be easy to get the validator to rename fields on
the way through?

Something like:

data = {'email': '[email protected]'}

class MyValidator(validators.Schema):
    email = validators.Email(not_empty=True, new_field_name='user_email')

my_validator = MyValidator()

valid_data = my_validator.to_python(data)

print valid_data

## {'user_email': '[email protected]'}

Thanks

Ed

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