auto save

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'
+
+
+
+new_data=""
+with open(r'C:\Users\Administrator\Desktop\新建文件夹\file1.txt','r',encoding='utf-8') as file1:
+    for data in file1:
+        if '小兰:12本' in data:
+            data=data.replace('小兰:12本','小兰:21本')
+        new_data=data
+        
+with open(r'C:\Users\Administrator\Desktop\新建文件夹\file1.txt','w',encoding='utf-8') as file1:        
+    file1.write(new_data)
+    
+    
+    
+    #  file1.write("小兰:12本\n小丽:11本\n李文:9本\n张伟:16本\n")
+    #  file1.write("小兰:12本\n")
+
+# file1.close()