auto save

diy.py

@@ -5,14 +5,24 @@ file1.write('小丽：11本\n')
 file1.write('李文：9本\n')
 file1.close()
 
+
+file1=open(r"C:\Users\admin\Desktop\test.txt","w",encoding="utf-8")
+file1.write("小兰：12本\n")
+file1.close()
+
 with open(r"C:\Users\admin\Desktop\test.txt","a",encoding="utf-8") as file1:
     file1.write('张伟：16本\n')
-
+#
 with open(r"C:\Users\admin\Desktop\test.txt","r",encoding="utf-8") as file1:
     a=file1.read()
     print(a)
 
+new_data=""
 with open(r"C:\Users\admin\Desktop\test.txt","r",encoding="utf-8") as file1:
     for data in file1:
         if "小兰：12本" in data:
-            print("数据在里面")
\ No newline at end of file
+           data=data.replace("小兰：12本","小兰：100本")
+        new_data +=data
+         
+with open(r"C:\Users\admin\Desktop\test.txt","w",encoding="utf-8") as file1:
+    file1.write(new_data)