use f-strings for string formatting

emilykl · web-flow · commit 73f0086aa478 · 2026-06-16T14:58:28.000-04:00
diff --git a/plotly/express/_core.py b/plotly/express/_core.py
@@ -973,9 +973,8 @@ def make_trace_spec(args, constructor, attrs, trace_patch):
                 )
             else:
                 raise ValueError(
-                    "Invalid value '%s' for `marginal_%s`. Supported marginal "
-                    "plot types are: 'rug', 'box', 'violin', 'histogram'."
-                    % (args["marginal_" + letter], letter)
+                    f"Invalid value '{args['marginal_' + letter]}' for `marginal_{letter}`."
+                    "Supported marginal plot types are: 'rug', 'box', 'violin', 'histogram'."
                 )
             if "color" in attrs or "color" not in args:
                 if "marker" not in trace_spec.trace_patch:

Original file line number	Diff line number	Diff line change
`@@ -973,9 +973,8 @@ def make_trace_spec(args, constructor, attrs, trace_patch):`
`973`	`973`	`)`
`974`	`974`	`else:`
`975`	`975`	`raise ValueError(`
`976`		- "Invalid value '%s' for `marginal_%s`. Supported marginal "
`977`		`- "plot types are: 'rug', 'box', 'violin', 'histogram'."`
`978`		`- % (args["marginal_" + letter], letter)`
	`976`	+ f"Invalid value '{args['marginal_' + letter]}' for `marginal_{letter}`."
	`977`	`+ "Supported marginal plot types are: 'rug', 'box', 'violin', 'histogram'."`
`979`	`978`	`)`
`980`	`979`	`if "color" in attrs or "color" not in args:`
`981`	`980`	`if "marker" not in trace_spec.trace_patch:`