save project

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'
 file=open(r"C:\Users\Public\Desktop\book.txt","w",encoding="utf-8")
 file.write("小兰:12本,小丽:11本,李文:9本,张伟:16本")
-file.close()
\ No newline at end of file
+file.close()
+
+with open(r"C:\Users\Public\Desktop\book.txt","a",encoding="utf-8") as file:
+    file.write("小兰:12本\n")
\ No newline at end of file