save project

diy.py

 with open(r'/Users/zengtao/Desktop/sales_list.txt','r',encoding='utf-8')as f:
 with open(r'/Users/zengtao/Desktop/sales_list.txt','r',encoding='utf-8')as f:
-    a=f.read()
+    a=f.readline(5)
     print(a)
     print(a)
\ No newline at end of file