auto save

diy.py

@@ -2,8 +2,14 @@
 #file=open(r"C:\Users\Administrator\Desktop\新建文件夹 (2)\book.txt","w",encoding="utf-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.write('小兰：12本')
 #file.close()
 #file.close()
+new_data=''
 with open(r"C:\Users\Administrator\Desktop\新建文件夹 (2)\book.txt","r",encoding="utf-8") as file:
 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:
+    for data in file:
         if '小兰：12本' in date:
         if '小兰：12本' in date:
-            print("数据在文件中")
-      
+            data=data.replace('小兰：12本','小兰：11本')
+        new_data+=data
+with open(r"C:\Users\Administrator\Desktop\新建文件夹 (2)\book.txt","w",encoding="utf-8") as file:
+    file.write(new_data)
+with open(r"C:\Users\Administrator\Desktop\新建文件夹 (2)\book.txt","r",encoding="utf-8") as file:
+    a=file.read()
+    print(a)
\ No newline at end of file