[compat] Remove PY2 compat artefacts

- No need to specific types
- Remove __future__ imports

docs/migrating.rst

@@ -29,7 +29,6 @@ can be included in a single Django migration. For example:
 .. code-block:: python
 
     # -*- coding: utf-8 -*-
-    from __future__ import unicode_literals
     from django.db import migrations, models
 
 

polymorphic/admin/parentadmin.py

@@ -1,8 +1,6 @@
 """
 The parent admin displays the list view of the base model.
 """
-import sys
-
 from django.contrib import admin
 from django.contrib.admin.helpers import AdminErrorList, AdminForm
 from django.contrib.admin.templatetags.admin_urls import add_preserved_filters
@@ -11,6 +9,7 @@ from django.core.exceptions import ImproperlyConfigured, PermissionDenied
 from django.db import models
 from django.http import Http404, HttpResponseRedirect
 from django.template.response import TemplateResponse
+from django.urls import URLResolver
 from django.utils.encoding import force_text
 from django.utils.http import urlencode
 from django.utils.safestring import mark_safe
@@ -20,17 +19,6 @@ from polymorphic.utils import get_base_polymorphic_model
 
 from .forms import PolymorphicModelChoiceForm
 
-try:
-    # Django 2.0+
-    from django.urls import URLResolver
-except ImportError:
-    # Django < 2.0
-    from django.urls import RegexURLResolver as URLResolver
-
-
-if sys.version_info[0] >= 3:
-    long = int
-
 
 class RegistrationClosed(RuntimeError):
     "The admin model can't be registered anymore at this point."
@@ -293,9 +281,9 @@ class PolymorphicParentModelAdmin(admin.ModelAdmin):
             try:
                 pos = path.find("/")
                 if pos == -1:
-                    object_id = long(path)
+                    object_id = int(path)
                 else:
-                    object_id = long(path[0:pos])
+                    object_id = int(path[0:pos])
             except ValueError:
                 raise Http404(
                     "No ct_id parameter, unable to find admin subclass for path '{0}'.".format(

polymorphic/base.py

@@ -2,8 +2,6 @@
 """
 PolymorphicModel Meta Class
 """
-from __future__ import absolute_import
-
 import inspect
 import os
 import sys

polymorphic/compat.py

@@ -1,22 +1,4 @@
 """Compatibility with Python 2 (taken from 'django.utils.six')"""
-import sys
-
-PY2 = sys.version_info[0] == 2
-PY3 = sys.version_info[0] == 3
-
-
-if PY3:
-    string_types = (str,)
-    integer_types = (int,)
-    class_types = (type,)
-    text_type = str
-    binary_type = bytes
-
-    MAXSIZE = sys.maxsize
-else:
-    string_types = (basestring,)
-    integer_types = (int, long)
-
 
 def with_metaclass(meta, *bases):
     class metaclass(type):

polymorphic/contrib/extra_views.py

@@ -4,8 +4,6 @@ The ``extra_views.advanced`` provides a method to combine that with a create/upd
 
 This package provides classes that support both options for polymorphic formsets.
 """
-from __future__ import absolute_import
-
 import extra_views
 from django.core.exceptions import ImproperlyConfigured
 

polymorphic/managers.py

@@ -2,7 +2,6 @@
 """
 The manager class for use in the models.
 """
-from __future__ import unicode_literals
 
 from django.db import models
 

polymorphic/models.py

@@ -2,8 +2,6 @@
 """
 Seamless Polymorphic Inheritance for Django Models
 """
-from __future__ import absolute_import
-
 from django.contrib.contenttypes.models import ContentType
 from django.db import models
 from django.db.models.fields.related import (

polymorphic/query.py

@@ -2,8 +2,6 @@
 """
 QuerySet for PolymorphicModel
 """
-from __future__ import absolute_import
-
 import copy
 from collections import defaultdict
 
@@ -177,7 +175,7 @@ class PolymorphicQuerySet(QuerySet):
         """translate the field paths in the args, then call vanilla order_by."""
         field_names = [
             translate_polymorphic_field_path(self.model, a)
-            if isinstance(a, compat.string_types)
+            if isinstance(a, str)
             else a  # allow expressions to pass unchanged
             for a in field_names
         ]

polymorphic/query_translate.py

@@ -2,8 +2,6 @@
 """
 PolymorphicQuerySet support functions
 """
-from __future__ import absolute_import
-
 import copy
 from collections import deque
 
@@ -144,7 +142,7 @@ def translate_polymorphic_field_path(queryset_model, field_path):
     into modela__modelb__modelc__field3.
     Returns: translated path (unchanged, if no translation needed)
     """
-    if not isinstance(field_path, compat.string_types):
+    if not isinstance(field_path, str):
         raise ValueError("Expected field name as string: {0}".format(field_path))
 
     classname, sep, pure_field_path = field_path.partition("___")

polymorphic/showfields.py

@@ -40,7 +40,7 @@ class ShowFieldBase(object):
                 out += content.__class__.__name__
         elif issubclass(field_type, models.ManyToManyField):
             out += "%d" % content.count()
-        elif isinstance(content, compat.integer_types):
+        elif isinstance(content, int):
             out += str(content)
         elif content is None:
             out += "None"

polymorphic/templatetags/polymorphic_admin_tags.py

@@ -31,7 +31,7 @@ class BreadcrumbScope(Node):
         # Instead, have an assignment tag that inserts that in the template.
         base_opts = self.base_opts.resolve(context)
         new_vars = {}
-        if base_opts and not isinstance(base_opts, compat.string_types):
+        if base_opts and not isinstance(base_opts, str):
             new_vars = {
                 "app_label": base_opts.app_label,  # What this is all about
                 "opts": base_opts,

polymorphic/tests/test_multidb.py

@@ -1,5 +1,3 @@
-from __future__ import print_function
-
 from django.contrib.contenttypes.models import ContentType
 from django.db.models import Q
 from django.test import TestCase

polymorphic/utils.py

@@ -1,5 +1,3 @@
-import sys
-
 from django.contrib.contenttypes.models import ContentType
 from django.db import DEFAULT_DB_ALIAS
 
@@ -59,12 +57,9 @@ def sort_by_subclass(*classes):
     """
     Sort a series of models by their inheritance order.
     """
-    if sys.version_info[0] == 2:
-        return sorted(classes, cmp=_compare_mro)
-    else:
-        from functools import cmp_to_key
+    from functools import cmp_to_key
 
-        return sorted(classes, key=cmp_to_key(_compare_mro))
+    return sorted(classes, key=cmp_to_key(_compare_mro))
 
 
 def get_base_polymorphic_model(ChildModel, allow_abstract=False):