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app.py

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+import gradio as gr
+def ping(L=3.0): return {"ok": True, "L": float(L)}
+demo = gr.Interface(fn=ping, inputs=gr.Number(value=3.0, label="Span L [m]"),
+                    outputs=gr.JSON(label="Result"), title="Beam Calculator (placeholder)")
+if __name__ == "__main__": demo.launch()