Update app.py

app.py

@@ -1,5 +1,27 @@
+from pathlib import Path
 import gradio as gr
 
+def upload_file(filepath):
+    name = Path(filepath).name
+    return [gr.UploadButton(visible=False), gr.DownloadButton(label=f"Download {name}", value=filepath, visible=True)]
+
+def download_file():
+    return [gr.UploadButton(visible=True), gr.DownloadButton(visible=False)]
+
+with gr.Blocks() as demo:
+    gr.Markdown("First upload a file and and then you'll be able download it (but only once!)")
+    with gr.Row():
+        u = gr.UploadButton("Upload a file", file_count="single")
+        d = gr.DownloadButton("Download the file", visible=False)
+
+    u.upload(upload_file, u, [u, d])
+    d.click(download_file, None, [u, d])
+
+
+demo.launch()
+
+
+'''
 def greet(name, intensity):
     return "Hello, " + name + "!" * int(intensity)
 
@@ -10,3 +32,4 @@ demo = gr.Interface(
 )
 
 demo.launch()
+'''