auto save

diy.py

@@ -8,5 +8,5 @@ for i in a:
         sum=sum+int(sales)
         sum=sum+int(sales)
     result=data[0]+str(sum)+'\n'
     result=data[0]+str(sum)+'\n'
     final_sum.append(result)
     final_sum.append(result)
-with open(r"c:\Users\Administrator\Documents\lesson13-4\sales_list.txt","r",encoding="utf-8")as f:
+with open(r"c:\Users\Administrator\Documents\lesson13-4\sales_list.txt","a",encoding="utf-8")as f:
     f.writelines(final_sum)
     f.writelines(final_sum)
\ No newline at end of file