auto save

diy.py

@@ -4,10 +4,12 @@ with open(r"c:\Users\admin\Desktop\test.txt","a",encoding="utf-8") as file:
     file.write("小明：12本\n")
 with open(r"c:\Users\admin\Desktop\test.txt","r",encoding="utf-8") as file:
     a=file.read()
+new_data=""
 with open(r"c:\Users\admin\Desktop\test.txt","r",encoding="utf-8") as file:
-    new_data=""
     for data in file:
-        if "小王:12本" in data:
-            data=data.replace("小王:12本","小王:50本")
+        if "小王：12本" in data:
+            data=data.replace("小王：12本","小王:50本")
         new_data=new_data+data
-    print(new_data)    
\ No newline at end of file
+#    print(new_data)    
+with open(r"c:\Users\admin\Desktop\test.txt","w",encoding="utf-8") as file:
+    file.write(new_data)
\ No newline at end of file