              NullableBooleanSerializer():
                  field = BooleanField(allow_null=True, required=False)
          """)
  
          self.assertEqual(unicode_repr(NullableBooleanSerializer()), expected)
  
      def test_method_field(self):
          """
          Properties and methods on the model should be allowed as `Meta.fields`
          values, and should map to `ReadOnlyField`.
 
</s> remove     value = unicode_repr(value)
 </s> add     value = repr(value) </s> remove 
from __future__ import absolute_import

 </s> add  </s> remove class UniqueValidator(object):
 </s> add class UniqueValidator: </s> remove class BaseRenderer(object):
 </s> add class BaseRenderer: </s> remove class BaseParser(object):
 </s> add class BaseParser:
        self.assertEqual(repr(NullableBooleanSerializer()), expected)
              NullableBooleanSerializer():
                  field = BooleanField(allow_null=True, required=False)
          """)
  
        self.assertEqual(repr(NullableBooleanSerializer()), expected)
  
      def test_method_field(self):
          """
          Properties and methods on the model should be allowed as `Meta.fields`
          values, and should map to `ReadOnlyField`.
keep keep keep keep replace keep keep keep keep keep
 Dropped Python 2 compatibility. (#6615)

Thanks to Jon Dufresne (@jdufresne) for review.

Co-authored-by: Asif Saif Uddin <auvipy@gmail.com>
Co-authored-by: Rizwan Mansuri <Rizwan@webbyfox.com> 
tests/test_model_serializer.py