Update app.py

app.py

@@ -38,25 +38,26 @@ paper=""
 if submit_paper:    
   paper = get_paper(pname)
 
+name=""
 if paper:
   name = paper.title+'.pdf'
   name = name.replace('?', '')
   name = "downloads/" + name
   
-  tpages = len(list(extract_pages(name)))
-  print("total pages=", tpages)
-  pgs = [i+1 for i in range(tpages)]
+tpages = len(list(extract_pages(name)))
+print("total pages=", tpages)
+pgs = [i+1 for i in range(tpages)]
   
-  start_page = 1
-  end_page = 1
+start_page = 1
+end_page = 1
   
-  with st.form(key = "page_form"):
-    col1, col2 = st.columns(2)
-    with col1:
-      s_page = st.selectbox(label = "Start Page", options = pgs)
-    with col2:
-      e_page = st.selectbox(label = "End Page", options = pgs, index = pgs[-1]-1)
-    submit_pages = st.form_submit_button(label = "Convert To Audio")
+with st.form(key = "page_form"):
+  col1, col2 = st.columns(2)
+  with col1:
+    s_page = st.selectbox(label = "Start Page", options = pgs)
+  with col2:
+    e_page = st.selectbox(label = "End Page", options = pgs, index = pgs[-1]-1)
+  submit_pages = st.form_submit_button(label = "Convert To Audio")
     
 if submit_pages:
   if start_page > end_page: