          """
          PK fields other than AutoField fields should not be read_only by default.
          """
          serializer = CharPrimaryKeyModelSerializer()
          self.assertEquals(serializer.fields['id'].read_only, False)
  
  
  class DateFieldTest(TestCase):
      """
      Tests for the DateFieldTest from_native() and to_native() behavior
 
</s> remove         f = serializers.TimeField(output_format="%H - %S [%f]")
 </s> add         f = serializers.TimeField(format="%H - %S [%f]") </s> remove         f = serializers.DateTimeField(output_format="%Y - %H:%M")
 </s> add         f = serializers.DateTimeField(format="%Y - %H:%M") </s> remove from rest_framework.utils.dates import get_readable_date_format
 </s> add  </s> remove                                           "HH:MM[:ss[.uuuuuu]]"])
 </s> add                                           "hh:mm[:ss[.uuuuuu]]"]) </s> remove                                           "YYYY-MM-DD HH:MM[:ss[.uuuuuu]][TZ]"])
 </s> add                                           "YYYY-MM-DDThh:mm[:ss[.uuuuuu]][+HHMM|-HHMM|Z]"])
        self.assertEqual(serializer.fields['id'].read_only, False)
          """
          PK fields other than AutoField fields should not be read_only by default.
          """
          serializer = CharPrimaryKeyModelSerializer()
        self.assertEqual(serializer.fields['id'].read_only, False)
  
  
  class DateFieldTest(TestCase):
      """
      Tests for the DateFieldTest from_native() and to_native() behavior
keep keep keep keep replace keep keep keep keep keep
 Clean ups to datetime formatting 
rest_framework/tests/fields.py