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'
+#l=open(r'C:\Users\Administrator\Desktop\test.txt','w',encoding='utf-8')
+#l.write('小兰:12本,小丽:11本\n')
+#l.close()
+new_data='' 
+with open(r'C:\Users\Administrator\Desktop\test.txt','r',encoding='utf-8') as l:   
+    for data in l:
+        if '李文:9本' in data:
+            data=data.replace('李文:9本','李文:10本')
+        new_data+=data
+with open(r'C:\Users\Administrator\Desktop\test.txt','w',encoding='utf-8') as l:   
+  l.write(new_data)
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