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app.py

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+import gradio as gr
+
+def calculator(num1, operation, num2):
+    if operation == "add":
+        return num1 + num2
+    elif operation == "subtract":
+        return num1 - num2
+    elif operation == "multiply":
+        return num1 * num2
+    elif operation == "divide":
+        return num1 / num2
+
+
+demo = gr.Interface(
+    fn=calculator,
+    inputs=[
+            gr.Number(value=4), 
+            gr.Radio(["add", "subtract", "multiply", "divide"]), 
+            "number"
+            ],
+    outputs="number",
+    examples=[
+        [5, "add", 3],
+        [4, "divide", 2],
+        [-4, "multiply", 2.5],
+        [0, "subtract", 1.2],
+    ],
+    title="test calculator",
+    description="heres a sample **toy calculator**. enjoy!",
+)
+
+demo.launch()