auto save

diy.py

@@ -3,10 +3,14 @@ with open(r"C:\Users\EDY\Desktop\xx.txt","a",encoding="utf-8") as a:
     a.write('小兰：12本')
     a.write('小丽：11本')
     a.write('张伟：16本')
+new_data="" 
 with open(r"C:\Users\EDY\Desktop\xx.txt","r",encoding="utf-8") as a1:  
     for i in a1:
         if '小兰：12本' in i:
-            print("在里面")
+            i=i.replace("小兰：12本","小兰：15本")
+        new_data+=i
+with open(r"C:\Users\EDY\Desktop\xx.txt","w",encoding="utf-8") as a:
+    a.write(new_data)