save project

diy.py

-a=open(r,'c:\Users\青青草\Documents\lesson13-1\sales_list.txt','r',encoding='utf-8') 
-a.read()
-a.open()
\ No newline at end of file
+with open(r'c:\Users\青青草\Documents\lesson13-1\sales_list.txt','r',encoding='utf-8') as a:
+    a.read()