save project

diy.py

 # 写入同学们的捐赠明细：'小兰：12本'、'小丽：11本'、'李文：9本'、'张伟：16本'
 # a=open(r"C:\Users\Lenovo\Desktop\新建文件夹\test.txt","w",encoding="utf-8")
-# a.write('小兰: 12本')
+# a.write('小兰: 12本'=""
+new_a=
 with open(r"C:\Users\Lenovo\Desktop\新建文件夹\test.txt","r",encoding="utf-8") as file:
     for a in file:
         if '小兰：12本' in a：
+            a=a.replace('小兰：12本','小兰：10本')
+        new_a+=a
+    with open(r"C:\Users\Lenovo\Desktop\新建文件夹\test.txt",'w',encoding="utf-8") as file:        
+        
+        file.write(v)
             print('数据在文件中') 
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