auto save

diy2.py

-newi=""
-with open(r"C:\Users\mk\Desktop\新建文件夹\text.txt","w",encoding="utf-8")as file:
-    file.write("小明：12本\n")
-with open(r"C:\Users\mk\Desktop\新建文件夹\text.txt","a",encoding="utf-8")as file:
-    file.write("小李：11本\n")
-    file.write("小马：14本\n")
-with open(r"C:\Users\mk\Desktop\新建文件夹\text.txt","r",encoding="utf-8")as file:
-    for i in file:
-        if "小明：12本"in i:
-            i=i.replace("小明：12本","小明：10本")
-        newi+=i
-with open(r"C:\Users\mk\Desktop\新建文件夹\text.txt","w",encoding="utf-8")as file:
-    file.write(newi)
-
-        
\ No newline at end of file