auto save

diy.py

 # 写入同学们的捐赠明细：'小兰：12本'、'小丽：11本'、'李文：9本'、'张伟：16本'
 
-with open(r'C:\Users\admin\Desktop\文件读写.txt','a',encoding='utf-8')as file1:
-
-    file1.write( '周仔 +10本\n' )
+with open(r'C:\Users\admin\Desktop\文件读写.txt','r',encoding='utf-8')as file1:
 
+    #file1.write( '周仔 +10本\n' )
+    for date in file1:
+        if '小强 +' in date:
+            print("数据在文件中")
+        else:
+            print("数据不在文件中")
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