Python Schematics: How to do model level validation? -

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i have python class following:

from schematics.models import model schematics.types import stringtype  class myclass(model):     some_string = stringtype()     other_string = stringtype()

i'm trying make value of other_stringrequired if some_string == "hello". how write model level validator this?

note docs schematics model level validation right here, documentation doesn't mention purpose of data , value arguments. furthermore, don't elaborate how model level validation @ in entire documentation.


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