auto save

diy.py

 # 写入同学们的捐赠明细：'小兰：12本'、'小丽：11本'、'小丽：11本'、'小丽：11本'
-with open(r'/Users/zhangshuai/Desktop/book.txt','a',encoding='utf-8')as file:
-    file.write('小兰:12本\n')
-    file.write('小丽:11本\n')
+with open(r'/Users/zhangshuai/Desktop/book.txt','r',encoding='utf-8') as file:
+    for data in file:
+        if '小兰:12本' in data:
+            print('小兰在数据文件中')
+        # if '小丽:11本' in data:
+        #     print('小丽在数据文件中')
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