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"","r",encoding="utf-8")as file1:
+    for data in file:
+        if "小兰:11本" in data:
+            data=data.replace("小兰:11本","小兰:10本")
+        new_data=new_data+data
+with open(r"","w",encoding="utf-8")as file1:
+     file1.write(new_data)
+with open(r"","r",encoding="utf-8")as file1:
+     a=file1.read()
+     print(a)
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