save project

diy.py

@@ -3,10 +3,18 @@ with open(r"D:\Desktop\test.txt","w",encoding='utf-8')as file:
     file.write('小兰：12本\n')
     file.write('小丽：11本\n')
     file.write('张伟：16本\n')
+new_data=""
 with open(r"D:\Desktop\test.txt","r",encoding='utf-8')as file:
     for data in file:
         if '小兰：12本' in data:
-            print("数据存在")
+            data=data.replace("小兰：12本","小兰：13本")
+        new_data+=data
+with open(r"D:\Desktop\test.txt","w",encoding='utf-8')as file:
+    file.write(new_data)
+
+
+        
+