auto save

diy.py

 while open(r'C:\Users\CM\Desktop\book.txt','r',encoding='utf-8') as file1:
     for data in file1:
         if'小强：10本'in data:
-            print('小强数据在文件中')
+            data=data.replace('小强')
         if'小兰：12本'in data:
             print('小兰数据在文件中')