auto save

diy.py

 
-with open(r'C:\Users\CM\Desktop\book.txt','a' ,encoding='utf-8')as file:
+with open(r'C:\Users\CM\Desktop\book.txt','a' ,encoding='utf-8')as file1:
     for data in file1:
         if '小强:10本'in data:
             print('小强在文件中')
         if '小兰：12本'in data:
             print('小兰在文件中')
+with open(r'C:\Users\CM\Desktop\book.txt','a' ,encoding='utf-8')as file1:
+    file1.write(new_data)
+