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'
+juanzeng=open("C:\\Users\\86159\\Desktop\\baimingming.txt","w",encoding="utf-8")
+juanzeng.write("小兰：12本\n")
+juanzeng.close()
+with open("C:\\Users\\86159\\Desktop\\baimingming.txt","a",encoding="utf-8") as juanzeng:
+    juanzeng.write("小wang：17本\n")
+    juanzeng.write("小zhang：19本\n")