auto save

diy.py

-# 写入同学们的捐赠明细：'小兰：12本'、'小丽：11本'、'李文：
-# jj=open(r"C:\Users\123\Desktop\新建文件夹\book.txt","w""utf-8")
-# jj.write("小兰:12本")
-# jj.write("小丽:11本")
-# jj.write("李文:9本")
-# jj.write("张伟:16本")
-# jj.close()
-with open(r"C:\Users\123\Desktop\新建文件夹\book.txt","a""utf-8") as jj:
-    jj.write("小强:12本")
-    jj.write("李明:15本")
-    jj.close()
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