small fix in __eq__ of the NoteEvent class

Author: SweepSweep2

o2tools/ojn.py

@@ -40,7 +40,12 @@ def __repr__(self):
         return f'{self.__class__.__name__}({attrs})'
 
     def __eq__(self, other):
-        return vars(self) == vars(other) and isinstance(other, self.__class__)
+        return (
+            isinstance(other, self.__class__) and
+            hasattr(self, "__dict__") and
+            hasattr(other, "__dict__") and
+            self.__dict__ == other.__dict__
+        )
 
 
 class PackageHeader:

o2tools/opa.py

@@ -1,7 +1,7 @@
 """
 Useful tools for OPA files.
 
-This has the same functionality for OPI files.
+This has the same functionality as OPI files.
 
 Source: