save project

diy.py

@@ -11,7 +11,7 @@ for i in a:
         result=b[0]+str(sum)+'\n'
     final_sum.append(result)
 
-with open(r'c:\Users\Admin\Documents\lesson13-1\new_sales_list.txt','r',encoding='utf-8') as file2:
+with open(r'c:\Users\Admin\Documents\lesson13-1\new_sales_list.txt','a',encoding='utf-8') as file2:
     file2.writelines(final_sum)