auto save

diy.py

 with open(r"c:\Users\Administrator\Documents\lesson13-1\sales_list.txt",'r',encoding="utf-8") as gstu:
     a=gstu.readlines()
     print(type(a[3:5]))
+l=[]
 for i in a:
     b=i.split()
     sum=0
     for j in b[1:]:
         sum=sum+int(j)
-    y=b[0]+str(sum)
-    print(y)
\ No newline at end of file
+    y=b[0]+str(sum)+'\n'
+    l.append(y)
+with open(r"c:\Users\Administrator\Documents\lesson13-1\sales_list.txt",'r',encoding="utf-8") as gstu:
+    gstu.writelines(l)
\ No newline at end of file