auto save

diy.py

+new_data=''
+with open(r'C:\Users\LX\Desktop\test.txt','r',encoding='utf-8') as file1:
+    for data in file1:
+        if "小兰,12本n": 
+            data=data.replace('小强:10本','小强:11本')
+        new_data+=data
+with open(r'C:\Users\LX\Desktop\test.txt','w',encoding='utf-8') as file1:
+    file1.write(new_data)
+
+          
\ No newline at end of file