save project

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\lenovo\Desktop\book.txt','a',encoding='utf-8')as file:
+with open(r'C:\Users\lenovo\Desktop\book.txt','r',encoding='utf-8')as file:
+    for data in file:
+        if '小兰：12本' in data:
+            print("存在")
 
-    file.write('大绿:123本\n')
-    file.write('小绿:321本\n')
\ No newline at end of file