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vega · Mar 20, 2023 · bf183e2 · bf183e2
1 parent f51d729
commit bf183e2
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/altair/vegalite/v5/api.py b/altair/vegalite/v5/api.py
@@ -774,7 +774,9 @@ def condition(predicate, if_true, if_false, **kwargs):
         if_true = if_true.to_dict()
     elif isinstance(if_true, str):
         if isinstance(if_false, str):
-            raise ValueError("A field cannot be used in both the `if_true` and `if_false` branches of a condition. One of the them has to specify a `value` or `datum` definition.")
+            raise ValueError(
+                "A field cannot be used in both the `if_true` and `if_false` branches of a condition. One of the them has to specify a `value` or `datum` definition."
+            )
         else:
             if_true = utils.parse_shorthand(if_true)
             if_true.update(kwargs)