auto save

diy.py

@@ -2,6 +2,8 @@
 #file=open(r"C:\Users\Administrator\Desktop\新建文件夹 (2)\book.txt","w",encoding="utf-8")
 #file.write('小兰：12本')
 #file.close()
-with open(r"C:\Users\Administrator\Desktop\新建文件夹 (2)\book.txt","w",encoding="utf-8") as file:
-    file.write('小美：12本')
+with open(r"C:\Users\Administrator\Desktop\新建文件夹 (2)\book.txt","r",encoding="utf-8") as file:
+    for date in file:
+        if '小兰：12本' in date:
+            print("数据在文件中")