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'
 with open(r"C:\Users\intel\Desktop\book.txt","r",encoding="utf-8") as file1:
+    new1=''
     for i in file1:
-        if "小强:10本" in i:
-            print("在")
+        if "小强：10本" in i:
+            i=i.replace("小强：10本","小强: 11本")
+        new1+=i
+        print(new1)
+with open(r"C:\Users\intel\Desktop\book.txt","w",encoding="utf-8") as file1:
+    file1.write(new1)
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