auto save

diy.py

 with open(r"c:\Users\86155\Documents\lesson13-1\sales_list.txt","r",encoding="utf-8") as file:
-    data=file.readlines()
-    print(data)
+    data=file.readlines()   #readlines()一次性读取很多行，返回列表，
+    #data是一个列表
+    
+for i in data:
+    print(i)
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