working changes

app.py

@@ -101,7 +101,9 @@ def updateZipForMultipleFiles(file_names_and_data, zipname='temp.zip'):
     # now add filename with its new data
     for individual_update in file_names_and_data:
         with zipfile.ZipFile(zipname, mode='a', compression=zipfile.ZIP_DEFLATED) as zf:
-            zf.writestr(individual_update['individual_file'], individual_update['xml_string_update'])    
+            zf.writestr(individual_update['individual_file'], individual_update['xml_string_update'])
+
+    return True
             
 
 def updateZValue(xml_data, xml_element_to_iterate, z_error_correction_in_metres):
@@ -120,15 +122,10 @@ st.markdown(
     '''
         # Adjust the height of all issues in a BCF file
 
-        Provide any spreadsheet (using a dropbox link) that has a column of revit IDs. 
-        A typical Revit ID is `60f91daf-3dd7-4283-a86d-24137b73f3da-0001fd0b`. 
-        This app will convert the ID to `3CPy6r22DAahSW8AIIobik`.
-
-
-        Select the sheet witin the spreadsheet and the column with the IDs.
+        Provide any bcf file. 
 
+        Select the height adjustment in metres.
 
-        Only the selected sheet will be returned, you can cut and paste the sheet back into the origial spreadsheet.
     '''
 )
 
@@ -152,11 +149,11 @@ if bcf_file_button:
 
     if '.bcf' in bcf_file_path:
 
+        updated = False
         partial_filename = bcf_file_path.rsplit('/')[-1]
         filename = partial_filename.split('.bcf')[0]
         bcf_file_path = bcf_file_path.replace('.bcf', '.zip')
 
-
         r = requests.get(bcf_file_path, stream=True)
         if r.status_code == 200:
             with open(path_original, 'wb') as f:
@@ -168,8 +165,8 @@ if bcf_file_button:
 
         height_change_button = st.number_input(
             "Height of the sheet to be returned",
-            # value=float,
             format="%.3f",
+            value=0.000,
             min_value=-1000.0,
             max_value=1000.0,
             step=0.001,
@@ -185,17 +182,19 @@ if bcf_file_button:
                 height_change,
             )
 
-            updateZipForMultipleFiles(
+            updated = updateZipForMultipleFiles(
                 update_bcf_info,
             )
 
-            with open(path_updated, "rb") as fp:
-                btn = st.download_button(
-                label="Download BCF file",
-                data=fp,
-                file_name=f"{filename}_height_{height_change}.bcf",
-                mime="application/zip"
-            )
+            if updated:
+
+                with open(path_updated, "rb") as fp:
+                    btn = st.download_button(
+                    label="Download BCF file",
+                    data=fp,
+                    file_name=f"{filename}_height_{height_change}.bcf",
+                    mime="application/zip"
+                )
 
     else: