auto save

diy.py

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