Add psycopg3 support

bitfield/types.py

@@ -260,5 +260,6 @@ def get_label(self, flag):
     from django.db.backends.postgresql.base import Database
     Database.extensions.register_adapter(Bit, lambda x: Database.extensions.AsIs(int(x)))
     Database.extensions.register_adapter(BitHandler, lambda x: Database.extensions.AsIs(int(x)))
-except ImproperlyConfigured:
+# Ignore in psycopg3 where there is no Database.extensions nor any need to adapt types
+except (ImproperlyConfigured, AttributeError):
     pass

conftest.py

@@ -21,7 +21,7 @@ def pytest_configure(config):
 
         if test_db == 'postgres':
             DATABASES['default'].update({
-                'ENGINE': 'django.db.backends.postgresql_psycopg2',
+                'ENGINE': 'django.db.backends.postgresql',
                 'USER': 'postgres',
             })
         elif test_db == 'mysql':

tox.ini

@@ -3,8 +3,9 @@
 # Taken from:
 # https://docs.djangoproject.com/en/dev/faq/install/#what-python-version-can-i-use-with-django
 envlist =
-    py{38,39,310}-django{32,40,41}-{sqlite,postgres},
-    py{38,39,310,311}-django{41}-{sqlite,postgres},
+    py{38,39,310}-django{32,40,41}-{sqlite,postgres}-psycopg2,
+    py{38,39,310,311}-django{41,42}-{sqlite,postgres}-psycopg2,
+    py311-django42-postgres-psycopg3,
 
 [gh-actions]
 python =
@@ -19,13 +20,16 @@ commands =
 passenv = DB
 deps =
   pytest
-  psycopg2-binary>=2.8
+  psycopg2: psycopg2-binary>=2.8
+  psycopg3: psycopg[binary]>=3.1
   django32: Django>=3.2,<3.3
   django32: pytest-django>=4.2
   django40: Django>=4.0,<4.1
   django40: pytest-django>=4.5
   django41: Django>=4.1,<4.2
   django41: pytest-django>=4.5
+  django42: Django>=4.2,<4.3
+  django42: pytest-django>=4.5
 setenv =
   sqlite: DB=sqlite
   postgres: DB=postgres