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'
-filel=open(r'C:\Users\Administrator\Desktop\book.txt','w',encoding='utf-8')
-filel.write('小兰:12本')
-filel.write('小丽:11本')
-filel.write('李文:9本')
-filel.write('张伟:16本')
-filel.close()
+#filel=open(r'C:\Users\Administrator\Desktop\book.txt','w',encoding='utf-8')
+#filel.write('小兰:12本')
+#filel.write('小丽:11本')
+#filel.write('李文:9本')
+#filel.write('张伟:16本')
+#filel.close()
 
 with open(r'C:\Users\Administrator\Desktop\book.txt','a',encoding='utf-8')as filel:
                 filel.write('小强:12本')