auto save

diy.py

-file= open(r'C:\Users\CM\Desktop\book.txt','a',encoding='utf-8')
-file.write('小强:10本\n')
-file.write('李明:10本\n')
+with open(r'C:\Users\CM\Desktop\book.txt','r',encoding='utf-8') as file:
+#file.write('小强:10本\n')
+#file.write('李明:10本\n')
+for data in file:
+    if "小强:10本" in data:
+        if "小兰:10本" in data:
+            print("数据在文件中")
 file.close()
\ No newline at end of file