Update app.py

app.py

@@ -221,7 +221,9 @@ if file_to_lookat !=[] and sub:
             tovcf['alt']=table_of_penn_file['Alt']
             nameuse=re.sub('xlsx$','vcf',file_to_lookat[j].name)
             tovcf.to_csv(nameuse,sep='\t',header=False, index=False)
-            bytes_data=nameuse.read()
+            with open(nameuse,"rb") as txt_file:
+                bytes_data=txt_file.read()
+                txt_file.clost()
             with open(os.path.join("input",nameuse),"wb") as f:
                 f.write(bytes_data)
                 f.close()