save project

diy.py

@@ -3,6 +3,11 @@ with open(r"D:\Desktop\test.txt","w",encoding='utf-8')as file:
     file.write('小兰：12本\n')
     file.write('小丽：11本\n')
     file.write('张伟：16本\n')
+with open(r"D:\Desktop\test.txt","r",encoding='utf-8')as file:
+    for data in file:
+        if '小兰：12本' in data:
+            print("数据存在")
+