save project

diy.py

@@ -4,5 +4,9 @@
 # file1.write('小丽:11本\n')
 # file1.write('小强:10本\n')
 # file1.close()
-with open(r'C:\Users\z0116\Desktop\book.txt','a',encoding='utf-8') as file:
-    file.write('李伟:16本\n')
\ No newline at end of file
+# with open(r'C:\Users\z0116\Desktop\book.txt','a',encoding='utf-8') as file:
+#     file.write('李伟:16本\n')
+with open(r'C:\Users\z0116\Desktop\book.txt','r',encoding='utf-8') as file1:
+    for data in file1:
+        if '小强:10本\n'in file1:
+            print("数据在文件中")
\ No newline at end of file