auto save

diy.py

-with open(r'/Users/xuechenghan/Desktop/sales_list.txt,'r',encoding='utf-8') as file:
+with open(r'/Users/xuechenghan/Documents/lesson13-3/sales_list.txt,'r',encoding='utf-8') as file:
     a=file.readlines()
     a=file.readlines()
 for i in a:
 for i in a:
     print(i)
     print(i)
\ No newline at end of file