Schematics with relaxed validation

permissive.py

from schematics import types
from schematics import models
from schematics import exceptions

class PermissiveType(object):
    def to_native(self, value, context=None):
        try:
            return super(PermissiveType, self).to_native(value, context)
        except exceptions.BaseError:
            return value

    def to_primitive(self, value, context=None):
        try:
            return super(PermissiveType, self).to_primitive(value, context)
        except exceptions.BaseError:
            return value

class IntType(PermissiveType, types.IntType):
    pass
class StringType(PermissiveType, types.StringType):
    pass

class Model(models.Model):
    def __getattr__(self, attr):
        return self.__dict__['_initial'].get(attr, None)

class Foo(Model):
    val = IntType()
    name = StringType()

x = Foo({'val': 'asdf', 'bar': 'xyz', 'name': 123.0}, strict=False)
print(x.val)
print(x.bar)
print(x.name)