fixup! Update to csv reader instead of fragile txt replace

Author: rachelekm

deployment/dataproc/gtfs-feed-fetcher/migrate_feeds_to_otpv1.py

@@ -52,25 +52,25 @@ def modify_septa_bus():
     otpv1_supported_route_type = '3'
     try:
         updated_rows = []
-        with open(txt_path_to_update, 'r', newline='', encoding='utf-8') as csvfile:
+        with open(txt_path_to_update, 'r') as csvfile:
             reader = csv.DictReader(csvfile)
             header = reader.fieldnames
             if column_to_update not in header:
-                raise ValueError(f"Column '{column_to_update}' not found in routes.txt")
+                raise ValueError('Column %s not found in routes.txt', column_to_update)
             for row in reader:
                 if row[column_to_update] == str(new_route_type):
                     row[column_to_update] = str(otpv1_supported_route_type)
-                    LOG.info(f"Converted route_id '{row['route_id']}' from type {new_route_type} to {otpv1_supported_route_type}")
+                    LOG.info('Converted route_id {} from type {} to {}'.format(row['route_id'], new_route_type, otpv1_supported_route_type))
                 updated_rows.append(row)
 
-        with open(txt_path_to_update, 'w', newline='', encoding='utf-8') as csvfile:
+        with open(txt_path_to_update, 'w') as csvfile:
             writer = csv.DictWriter(csvfile, fieldnames=header)
             writer.writeheader()
             writer.writerows(updated_rows)
 
         LOG.debug('Modified %s', txt_path_to_update)
     except Exception as e:
-        raise ValueError('Error modifying %s: %s', txt_path_to_update, e)
+        raise ValueError('Error modifying {}: {}'.format(txt_path_to_update, e))
 
 def main():
     filenames_to_modify = ['septa_bus']