auto save

diy.py

+with open(r"D:\编程备课\python\py2的答案\12.文件读写（一）\test.txt","r",encoding="utf-8") as file:    
+    for i in file:
+        if '小强:10本' in i：
+            print("小强存在")
+        if '小兰:12本' in i：
+            print("小兰存在")