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'
 # 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'
-with open(r"C:\\Users\\BBTC\\Desktop\\book.txt","a",encoding="utf-8")as file:
-    for data in file1:
-        if"小兰：12本" in data:
-            print("在")
-
+# file1=open(r"C:\\Users\\BBTC\\Desktop\\book.txt","w",encoding="utf-8")
 
 
+# file1.write("小兰:12\n")
+# file1.write("小丽:11\n")
+# file1.write("李文:9\n")
+# file1.write("张伟:16\n")
+# file1.close()
+with open(r"C:\\Users\\BBTC\\Desktop\\book.txt","a",encoding="utf-8")as file:
     file.write("小兰:12\n")
     file.write("小兰:12\n")
     file.write("小丽:11\n")
     file.write("小丽:11\n")