Remove python_2_unicode_compatible method

example/orders/models.py

@@ -1,12 +1,10 @@
 from django.db import models
 from django.utils.dates import MONTHS_3
-from django.utils.six import python_2_unicode_compatible
 from django.utils.translation import ugettext_lazy as _
 
 from polymorphic.models import PolymorphicModel
 
 
-@python_2_unicode_compatible
 class Order(models.Model):
     """
     An example order that has polymorphic relations
@@ -23,7 +21,6 @@ class Order(models.Model):
         return self.title
 
 
-@python_2_unicode_compatible
 class Payment(PolymorphicModel):
     """
     A generic payment model.

polymorphic/compat.py

@@ -24,22 +24,3 @@ def with_metaclass(meta, *bases):
             return meta(name, bases, d)
 
     return type.__new__(metaclass, "temporary_class", (), {})
-
-
-def python_2_unicode_compatible(klass):
-    """
-    A decorator that defines __unicode__ and __str__ methods under Python 2.
-    Under Python 3 it does nothing.
-
-    To support Python 2 and 3 with a single code base, define a __str__ method
-    returning text and apply this decorator to the class.
-    """
-    if PY2:
-        if "__str__" not in klass.__dict__:
-            raise ValueError(
-                "@python_2_unicode_compatible cannot be applied "
-                "to %s because it doesn't define __str__()." % klass.__name__
-            )
-        klass.__unicode__ = klass.__str__
-        klass.__str__ = lambda self: self.__unicode__().encode("utf-8")
-    return klass

polymorphic/managers.py

@@ -6,13 +6,11 @@ from __future__ import unicode_literals
 
 from django.db import models
 
-from polymorphic.compat import python_2_unicode_compatible
 from polymorphic.query import PolymorphicQuerySet
 
 __all__ = ("PolymorphicManager", "PolymorphicQuerySet")
 
 
-@python_2_unicode_compatible
 class PolymorphicManager(models.Manager):
     """
     Manager for PolymorphicModel

polymorphic/showfields.py

@@ -4,12 +4,10 @@ import re
 from django.db import models
 
 from . import compat
-from .compat import python_2_unicode_compatible
 
 RE_DEFERRED = re.compile("_Deferred_.*")
 
 
-@python_2_unicode_compatible
 class ShowFieldBase(object):
     """ base class for the ShowField... model mixins, does the work """