Improve error message wording

vega · Mar 26, 2023 · 50c12f7 · 50c12f7
1 parent ed59830
commit 50c12f7
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/altair/vegalite/v5/api.py b/altair/vegalite/v5/api.py
@@ -775,7 +775,7 @@ def condition(predicate, if_true, if_false, **kwargs):
     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."
+                "A field cannot be used as both the `if_true` and `if_false` values of a condition. One of them has to specify a `value` or `datum` definition."
             )
         else:
             if_true = utils.parse_shorthand(if_true)

diff --git a/tests/utils/test_schemapi.py b/tests/utils/test_schemapi.py
@@ -612,7 +612,7 @@ def test_chart_validation_errors(chart_func, expected_error_message):
 
 def test_multiple_field_strings_in_condition():
     selection = alt.selection_point()
-    expected_error_message = "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."
+    expected_error_message = "A field cannot be used as both the `if_true` and `if_false` values of a condition. One of them has to specify a `value` or `datum` definition."
     with pytest.raises(ValueError, match=expected_error_message):
         (
             alt.Chart(data.cars())