auto save

diy.py

@@ -9,8 +9,16 @@
         #file1.write("小强：12本")
         #file1.write("李明：15本")
 
+#with open(r'C:\Users\凤凰机器人金科3\Desktop\book.txt','r',encoding="utf-8") as file1:
+        #for i in file1:
+                #if "小强：12本"in i:
+                        #print("数据在文件中")
+new_data=""                        
 with open(r'C:\Users\凤凰机器人金科3\Desktop\book.txt','r',encoding="utf-8") as file1:
-        for i in file1:
-                if "小强：12本"in i:
-                        print("数据在文件中")
-
+        for data in file1:
+                if "小强：12本" in data:
+                      data = data.replace("小强：12本","小强：11本")
+                new_data+=data 
+                print(new_data)      
+with open(r'C:\Users\凤凰机器人金科3\Desktop\book.txt','w',encoding="utf-8") as file1:
+        file1.write(new_data)