You can now reset and restore your API owner settings.

src/ifcopenshell-python/ifcopenshell/api/owner/settings.py

@@ -2,10 +2,51 @@
 
 
 def get_application(ifc):
-    applications = ifc.by_type("IfcApplication") or [None]
-    return applications[0]
+    return (ifc.by_type("IfcApplication") or [None])[0]
 
 
 def get_user(ifc):
-    users = ifc.by_type("IfcPersonAndOrganization") or [None]
-    return users[0]
+    return (ifc.by_type("IfcPersonAndOrganization") or [None])[0]
+
+
+get_application_factory = get_application
+get_application_backup = get_application
+get_user_factory = get_user
+get_user_backup = get_user
+
+
+def factory_reset():
+    """Reset the get_user and get_application functions to what came out of box
+
+    When you are developing a custom application, you will typically override
+    the get_user and get_application function to your own needs. Sometimes you
+    want to reset it to before you monkey-patched it. This function does that
+    reset.
+    """
+    global get_application_factory
+    global get_application_backup
+    global get_application
+    global get_user_factory
+    global get_user_backup
+    global get_user
+    get_application_backup = get_application
+    get_application = get_application_factory
+    get_user_backup = get_user
+    get_user = get_user_factory
+
+
+def restore():
+    """Restore the get_user and get_application function prior to a reset
+
+    In case you want to restore the monkey-patched version of get_user and
+    get_application that existed before you applied a factory_reset(), this
+    function will do that.
+    """
+    global get_application_factory
+    global get_application_backup
+    global get_application
+    global get_user_factory
+    global get_user_backup
+    global get_user
+    get_application = get_application_backup
+    get_user = get_user_backup