auto save

diy.py

+new_date = ""
+with open(r'C:\Users\70471\Desktop\text.txt','r',encoding='utf-8') as file1:
+    for i in file1:
+        if "小明：11本" in i:
+            i = i.replace("小明：11本","小明：10本")
+            print(i)
+        new_date += i
+
+with open(r'C:\Users\70471\Desktop\text.txt','w',encoding="utf-8") as file1:
+    file1.write(new_date)
\ No newline at end of file