auto save

diy.py

 with open(r"c:\Users\Administrator\Documents\lesson13-1\sales_list.txt",'r',encoding="utf-8") as f:
 with open(r"c:\Users\Administrator\Documents\lesson13-1\sales_list.txt",'r',encoding="utf-8") as f:
-   f.readline()
-   print(i)
+    for i in f:
+        print(i)