first comit

venv/lib/python3.10/site-packages/environ/compat.py

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+# This file is part of the django-environ.
+#
+# Copyright (c) 2021-2022, Serghei Iakovlev <egrep@protonmail.ch>
+# Copyright (c) 2013-2021, Daniele Faraglia <daniele.faraglia@gmail.com>
+#
+# For the full copyright and license information, please view
+# the LICENSE.txt file that was distributed with this source code.
+
+"""This module handles import compatibility issues."""
+
+from importlib.util import find_spec
+
+if find_spec('simplejson'):
+    import simplejson as json
+else:
+    import json
+
+if find_spec('django'):
+    from django import VERSION as DJANGO_VERSION
+    from django.core.exceptions import ImproperlyConfigured
+else:
+    DJANGO_VERSION = None
+
+    class ImproperlyConfigured(Exception):
+        """Django is somehow improperly configured"""
+
+
+def choose_rediscache_driver():
+    """Backward compatibility for RedisCache driver."""
+
+    # django-redis library takes precedence
+    if find_spec('django_redis'):
+        return 'django_redis.cache.RedisCache'
+
+    # use built-in support if Django 4+
+    if DJANGO_VERSION is not None and DJANGO_VERSION >= (4, 0):
+        return 'django.core.cache.backends.redis.RedisCache'
+
+    # back compatibility with redis_cache package
+    return 'redis_cache.RedisCache'
+
+
+def choose_postgres_driver():
+    """Backward compatibility for postgresql driver."""
+    old_django = DJANGO_VERSION is not None and DJANGO_VERSION < (2, 0)
+    if old_django:
+        return 'django.db.backends.postgresql_psycopg2'
+    return 'django.db.backends.postgresql'
+
+
+def choose_pymemcache_driver():
+    """Backward compatibility for pymemcache."""
+    old_django = DJANGO_VERSION is not None and DJANGO_VERSION < (3, 2)
+    if old_django or not find_spec('pymemcache'):
+        # The original backend choice for the 'pymemcache' scheme is
+        # unfortunately 'pylibmc'.
+        return 'django.core.cache.backends.memcached.PyLibMCCache'
+    return 'django.core.cache.backends.memcached.PyMemcacheCache'
+
+
+REDIS_DRIVER = choose_rediscache_driver()
+"""The name of the RedisCache driver."""
+
+DJANGO_POSTGRES = choose_postgres_driver()
+"""The name of the PostgreSQL driver."""
+
+PYMEMCACHE_DRIVER = choose_pymemcache_driver()
+"""The name of the Pymemcache driver."""