Update app.py

app.py

@@ -1,20 +1,27 @@
 import gradio as gr
 
+# Function to update the student numbers dropdown based on the selected class
 def update_dropdown(class_prefix):
-    # Create a list of options based on the selected class prefix
-    student_numbers = [f"{class_prefix}{str(i).zfill(2)}" for i in range(1, 41)]
-    return student_numbers
+    # Check if a class prefix is selected
+    if class_prefix:
+        # Generate student numbers for the selected class
+        student_numbers = [f"{class_prefix}{str(i).zfill(2)}" for i in range(1, 41)]
+        return student_numbers
+    else:
+        # Return an empty list if no class prefix is selected
+        return []
 
-# Define the options for the first dropdown
+# List of class options for the dropdown
 class_options = ["5H", "5E", "5RS"]
 
-# Create the Gradio interface
+# Create the Gradio interface with two dropdowns
 with gr.Blocks() as demo:
     with gr.Row():
         class_dropdown = gr.Dropdown(label="Class", choices=class_options)
-        student_dropdown = gr.Dropdown(label="Student")
+        student_dropdown = gr.Dropdown(label="Student", choices=[])
 
+    # Update student dropdown when class dropdown changes
     class_dropdown.change(fn=update_dropdown, inputs=class_dropdown, outputs=student_dropdown)
 
-# Launch the app
+# Run the app
 demo.launch()