Add type hint to 'version'

vega · Dec 23, 2023 · 4eab849 · 4eab849
1 parent 201ff76
commit 4eab849
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/altair/utils/_dfi_types.py b/altair/utils/_dfi_types.py
@@ -121,7 +121,7 @@ class DataFrame(Protocol):
     to the dataframe interchange protocol specification.
     """
 
-    version = 0  # version of the protocol
+    version: int = 0  # version of the protocol
 
     def __dataframe__(
         self, nan_as_null: bool = False, allow_copy: bool = True