various 2.0 preparation things

Author: Kircheneer

.flake8

@@ -2,3 +2,4 @@
 # E501: Line length is enforced by Black, so flake8 doesn't need to check it
 # W503: Black disagrees with this rule, as does PEP 8; Black wins
 ignore = E501, W503
+exclude = .venv

diffsync/__init__.py

@@ -17,6 +17,7 @@
 import sys
 from inspect import isclass
 from typing import Callable, ClassVar, Dict, List, Optional, Tuple, Type, Union, Any, Set
+import warnings
 
 from pydantic import ConfigDict, BaseModel, PrivateAttr
 import structlog  # type: ignore
@@ -854,8 +855,15 @@ def count(self, model: Union[StrType, "DiffSyncModel", Type["DiffSyncModel"], No
         return self.store.count(model=model)
 
 
-# For backwards-compatibility, keep around the old name
-DiffSync = Adapter
+def DiffSync(*args: Any, **kwargs: Any) -> Adapter:  # noqa  pylint: disable=invalid-name
+    """For backwards-compatibility, keep around the old name."""
 
-# DiffSyncModel references DiffSync and DiffSync references DiffSyncModel. Break the typing loop:
+    warnings.warn(
+        "'diffsync.DiffSync' is deprecated and will be removed with 2.1, use 'diffsync.Adapter' instead.",
+        DeprecationWarning,
+    )
+    return Adapter(*args, **kwargs)
+
+
+# DiffSyncModel references Adapter and Adapter references DiffSyncModel. Break the typing loop:
 DiffSyncModel.model_rebuild()

docs/source/upgrading/01-upgrading-to-2.0.md

@@ -2,6 +2,10 @@
 
 With diffsync 2.0, there a couple of breaking changes. What they are and how to deal with them is described in this document.
 
+## Rename of the `diffsync.Diffsync` class to `diffsync.Adapter`
+
+The main diffsync class `diffsync.Diffsync` has been renamed to `diffsync.Adapter` as we have found that this is the verbiage that is most often used by users and explains the intent of the class clearer. The old name will still be around until 2.1, but is considered deprecated at this point.
+
 ## Upgrade to Pydantic's major version 2
 
 A [migration guide](https://docs.pydantic.dev/latest/migration/) is available in the Pydantic documentation. Here are the key things that may apply to your usage of diffsync:
@@ -22,7 +26,7 @@ class Person(DiffSyncModel):
     age: Optional[int]
 
 # After
-class BetterPerson(DiffSyncModel)
+class BetterPerson(DiffSyncModel):
     _identifiers = ("name",)
     _attributes = ("age",)