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app.py

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+
+import gradio as gr
+
+MAX_QUEUE_SIZE = 3
+
+def add_to_queue(name, age, queue_state):
+    if queue_state is None:
+        queue_state = []
+
+    if not name:
+        return ("Please enter your name.", queue_state, queue_state)
+
+    try:
+        age = int(age)
+        if age <= 0:
+            raise ValueError
+    except Exception:
+        return ("Please enter a valid positive age.", queue_state, queue_state)
+
+    if len(queue_state) >= MAX_QUEUE_SIZE:
+        return ("Queue is full. Only 3 people are allowed.", queue_state, queue_state)
+
+    queue_number = len(queue_state) + 1
+    person = {
+        "Queue No.": queue_number,
+        "Name": name,
+        "Age": age
+    }
+    queue_state.append(person)
+
+    message = f"Welcome, {name}! Your queue number is {queue_number}."
+    return message, queue_state, queue_state
+
+def reset_queue():
+    return "Queue has been reset.", [], []
+
+with gr.Blocks() as demo:
+    gr.Markdown("# Simple Queue System (First Come, First Served)")
+    gr.Markdown("Enter your name and age. Only 3 people can join the queue.")
+
+    queue_state = gr.State([])
+
+    with gr.Row():
+        name_input = gr.Textbox(label="Name")
+        age_input = gr.Number(label="Age", precision=0)
+
+    submit_btn = gr.Button("Join Queue")
+    reset_btn = gr.Button("Reset Queue")
+
+    status_output = gr.Textbox(label="Status", interactive=False)
+    queue_table = gr.Dataframe(
+        headers=["Queue No.", "Name", "Age"],
+        label="Current Queue",
+        datatype=["number", "str", "number"],
+        wrap=True
+    )
+
+    submit_btn.click(
+        fn=add_to_queue,
+        inputs=[name_input, age_input, queue_state],
+        outputs=[status_output, queue_state, queue_table]
+    )
+
+    reset_btn.click(
+        fn=reset_queue,
+        inputs=None,
+        outputs=[status_output, queue_state, queue_table]
+    )
+
+if __name__ == "__main__":
+    demo.launch()

requirements.txt

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+gradio>=4.0.0