Applied suggestion: Type annotation on class attribute

src/urllib3/exceptions.py

@@ -252,9 +252,12 @@ class IncompleteRead(HTTPError, httplib_IncompleteRead):
     for ``partial`` to avoid creating large objects on streamed reads.
     """
 
+    partial: int  # type: ignore[assignment]
+    expected: int
+
     def __init__(self, partial: int, expected: int) -> None:
-        self.partial: int = partial  # type: ignore[assignment]
-        self.expected: int = expected
+        self.partial = partial
+        self.expected = expected
 
     def __repr__(self) -> str:
         return "IncompleteRead(%i bytes read, %i more expected)" % (