Initial commit. Basic models mostly done.

venv/lib/python3.8/site-packages/django/db/models/utils.py

@@ -0,0 +1,21 @@
+def make_model_tuple(model):
+    """
+    Take a model or a string of the form "app_label.ModelName" and return a
+    corresponding ("app_label", "modelname") tuple. If a tuple is passed in,
+    assume it's a valid model tuple already and return it unchanged.
+    """
+    try:
+        if isinstance(model, tuple):
+            model_tuple = model
+        elif isinstance(model, str):
+            app_label, model_name = model.split(".")
+            model_tuple = app_label, model_name.lower()
+        else:
+            model_tuple = model._meta.app_label, model._meta.model_name
+        assert len(model_tuple) == 2
+        return model_tuple
+    except (ValueError, AssertionError):
+        raise ValueError(
+            "Invalid model reference '%s'. String model references "
+            "must be of the form 'app_label.ModelName'." % model
+        )