auto save

1.py

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