Fix format_exception on py<3.10

Author: frmdstryr

atomdb/base.py

@@ -11,6 +11,7 @@
 import asyncio
 import enum
 import logging
+import sys
 import traceback
 from base64 import b64decode, b64encode
 from collections.abc import MutableMapping
@@ -57,6 +58,16 @@
 
 PRIMITIVE_TYPES = (int, float, bool, str)
 
+if sys.version_info >= (3, 10):
+
+    def format_exception(e: Exception) -> str:
+        return "".join(traceback.format_exception(e))
+
+else:
+
+    def format_exception(e: Exception) -> str:
+        return "".join(traceback.format_exception(e.__class__, e, e.__traceback__))
+
 
 def find_subclasses(cls: Type[T]) -> ListType[Type[T]]:
     """Finds subclasses of the given class"""
@@ -769,7 +780,7 @@ def __log_restore_error__(
             f"\nRef: {self.__ref__}"
             f"\nScope: {pformat(scope)}"
             f"\nState: {pformat(state)}"
-            f"\n{''.join(traceback.format_exception(e))}"
+            f"\n{format_exception(e)}"
         )
 
     # --------------------------------------------------------------------------