create emailer version 1

env/Lib/site-packages/django/contrib/postgres/serializers.py

@@ -0,0 +1,10 @@
+from django.db.migrations.serializer import BaseSerializer
+
+
+class RangeSerializer(BaseSerializer):
+    def serialize(self):
+        module = self.value.__class__.__module__
+        # Ranges are implemented in psycopg2._range but the public import
+        # location is psycopg2.extras.
+        module = "psycopg2.extras" if module == "psycopg2._range" else module
+        return "%s.%r" % (module, self.value), {"import %s" % module}