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app.py

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+"""Pure Gradio Hello World App"""
+import gradio as gr
+
+
+def greet(name: str, enthusiasm: int = 1) -> str:
+    """Generate a greeting message.
+    
+    Args:
+        name: The name to greet
+        enthusiasm: Number of exclamation marks (1-5)
+    
+    Returns:
+        A personalized greeting
+    """
+    if not name:
+        return "Please enter a name!"
+    
+    exclamation = "!" * min(max(enthusiasm, 1), 5)
+    return f"Hello, {name}{exclamation} Welcome to the Gradio + FastAPI demo!"
+
+
+# Pure Gradio app - can run standalone or be mounted to FastAPI
+with gr.Blocks(title="Hello World Demo") as app:
+    gr.Markdown("# 👋 Hello World App")
+    gr.Markdown("Enter your name and choose your enthusiasm level!")
+    
+    with gr.Row():
+        with gr.Column():
+            name_input = gr.Textbox(
+                label="Your Name",
+                placeholder="Enter your name here...",
+                value="World"
+            )
+            enthusiasm_slider = gr.Slider(
+                minimum=1,
+                maximum=5,
+                value=1,
+                step=1,
+                label="Enthusiasm Level"
+            )
+            greet_btn = gr.Button("Greet Me!", variant="primary")
+        
+        with gr.Column():
+            output = gr.Textbox(
+                label="Greeting",
+                interactive=False
+            )
+    
+    greet_btn.click(
+        fn=greet,
+        inputs=[name_input, enthusiasm_slider],
+        outputs=output
+    )
+    
+    gr.Examples(
+        examples=[
+            ["Alice", 3],
+            ["Bob", 1],
+            ["Charlie", 5],
+        ],
+        inputs=[name_input, enthusiasm_slider],
+    )
+
+
+# This allows the app to run standalone
+if __name__ == "__main__":
+    app.launch(
+        server_name="0.0.0.0",
+        server_port=7860,
+        share=False
+    )