auto save

diy.py

 with open(r'c:\Users\Administrator\Documents\lesson13-1\sales_list.txt','r',encoding='utf-8') as file:
     a = file.readlines()
     # print(a)
+    dsb=[]
     for i in a:
         data=i.split()
         # print(data)
@@ -8,10 +9,11 @@ with open(r'c:\Users\Administrator\Documents\lesson13-1\sales_list.txt','r',enco
         sb=0
         for n in data[1:]:
             sb+=int(n)
-            nb=data[0]+str(sb)
-        print(nb)
-        
-
+            nb=data[0]+str(sb)+'\n'
+            dsb.append(nb)
+        # print(nb)
+with open(r'c:\Users\Administrator\Documents\lesson13-1\sales_list.txt','a',encoding='utf-8') as file:
+    file.writelines(dsb)