Fixed #28708 -- Added constants to detect the Python version.

django/utils/version.py

@@ -2,8 +2,18 @@ import datetime
 import functools
 import os
 import subprocess
+import sys
 from distutils.version import LooseVersion
 
+# Private, stable API for detecting the Python version. PYXY means "Python X.Y
+# or later". So that third-party apps can use these values, each constant
+# should remain as long as the oldest supported Django version supports that
+# Python version.
+PY36 = sys.version_info >= (3, 6)
+PY37 = sys.version_info >= (3, 7)
+PY38 = sys.version_info >= (3, 8)
+PY39 = sys.version_info >= (3, 9)
+
 
 def get_version(version=None):
     """Return a PEP 440-compliant version number from VERSION."""

tests/admin_scripts/tests.py

@@ -26,10 +26,10 @@ from django.db.migrations.recorder import MigrationRecorder
 from django.test import (
     LiveServerTestCase, SimpleTestCase, TestCase, override_settings,
 )
+from django.utils.version import PY36
 
 custom_templates_dir = os.path.join(os.path.dirname(__file__), 'custom_templates')
 
-PY36 = sys.version_info >= (3, 6)
 SYSTEM_CHECK_MSG = 'System check identified no issues'
 
 

tests/migrations/test_writer.py

@@ -5,7 +5,6 @@ import functools
 import math
 import os
 import re
-import sys
 import uuid
 from unittest import mock
 
@@ -25,11 +24,10 @@ from django.utils.deconstruct import deconstructible
 from django.utils.functional import SimpleLazyObject
 from django.utils.timezone import FixedOffset, get_default_timezone, utc
 from django.utils.translation import gettext_lazy as _
+from django.utils.version import PY36
 
 from .models import FoodManager, FoodQuerySet
 
-PY36 = sys.version_info >= (3, 6)
-
 
 class Money(decimal.Decimal):
     def deconstruct(self):

tests/view_tests/tests/test_debug.py

@@ -19,6 +19,7 @@ from django.urls import reverse
 from django.utils.encoding import force_bytes
 from django.utils.functional import SimpleLazyObject
 from django.utils.safestring import mark_safe
+from django.utils.version import PY36
 from django.views.debug import (
     CLEANSED_SUBSTITUTE, CallableSettingWrapper, ExceptionReporter,
     cleanse_setting, technical_500_response,
@@ -31,8 +32,6 @@ from ..views import (
     sensitive_method_view, sensitive_view,
 )
 
-PY36 = sys.version_info >= (3, 6)
-
 
 class User:
     def __str__(self):