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app.py

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+import gradio as gr
+
+def calculate_mpg(miles, fuel):
+    """
+    Core logic function to calculate MPG.
+    This replaces the logic inside the Tkinter class.
+    """
+    try:
+        # Input validation
+        if fuel <= 0:
+            return "Error: Fuel must be > 0"
+        if miles < 0:
+            return "Error: Miles cannot be negative"
+        
+        # Calculation
+        mpg = miles / fuel
+        return f"{round(mpg, 2)} MPG"
+        
+    except Exception as e:
+        return f"Error: {str(e)}"
+
+# Define the Gradio Interface
+# 1. Inputs: Two number boxes
+# 2. Output: A text box for the result
+# 3. Title/Description: For the top of the web page
+interface = gr.Interface(
+    fn=calculate_mpg,
+    inputs=[
+        gr.Number(label="Miles Driven", value=0),
+        gr.Number(label="Fuel Consumption (Gallons)", value=0)
+    ],
+    outputs=gr.Textbox(label="Calculated Fuel Economy"),
+    title="FUEL ECONOMY CALCULATOR",
+    description="Enter miles and fuel to calculate your MPG. This is a web-based version of our Tkinter assignment.",
+    theme="soft" # Optional: gives it a modern look
+)
+
+# Launch the app
+if __name__ == "__main__":
+    interface.launch()

requirements.txt

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+gradio