save project

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