Update app.py

app.py

@@ -105,13 +105,14 @@ def update(inp, file, public_link):
     print("public link", public_link)
     return molecule(pdb_path, public_link)
 
-public_link = ""
+
 demo = gr.Blocks()
 
 with demo:
     gr.Markdown("# PDB viewer using Mol*")
     gr.Markdown("""If using please cite 
     > David Sehnal, Sebastian Bittrich, Mandar Deshpande, Radka Svobodová, Karel Berka, Václav Bazgier, Sameer Velankar, Stephen K Burley, Jaroslav Koča, Alexander S Rose: Mol* Viewer: modern web app for 3D visualization and analysis of large biomolecular structures, Nucleic Acids Research, 2021; 10.1093/nar/gkab31.""")
+    public_link = gr.Variable()
     with gr.Row():
         with gr.Box():
             inp = gr.Textbox(
@@ -122,4 +123,6 @@ with demo:
             btn = gr.Button("View structure")
     mol = gr.HTML()
     btn.click(fn=update, inputs=[inp, file, public_link], outputs=mol)
-_, _, public_link = demo.launch()
+_, _, pl = demo.launch()
+
+public_link = pl