Create app.py

app.py

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+import gradio as gr
+
+options = {
+    "A1": ["aa1", "aa11", "aa111"],
+    "A2": ["aa2", "aa22", "aa222"],
+    "A3": []
+}
+
+def greet(option1, option2):
+    return f"Selected Option 1: {option1}\nSelected Option 2: {option2}"
+
+option1_dropdown = gr.inputs.Dropdown(choices=["A1", "A2", "A3"], label="Dropdown 1")
+option2_dropdown = gr.inputs.Dropdown(choices=[], label="Dropdown 2")  # Initial empty choices
+
+output_text = gr.outputs.Textbox()
+
+def update_options(option1):
+    option2_dropdown.choices = options.get(option1, [])  # Update choices for option2 based on option1
+
+gr.Interface(fn=greet, inputs=[option1_dropdown, option2_dropdown], outputs=output_text,
+             examples=[["A1", "aa1"], ["A2", "aa2"]], title="Dynamic Dropdowns",
+             preprocessing_hooks=[update_options]).launch()