save project

diy.py

-file=open(r'C:\book.txt','a',encoding='utf-8')
-file.write('小强:10本\n')
-file.write('李明:10本\n')
-file.close()
-with open(r'c:\book.txt','a',encoding='utf-8')as file:
-file.write('小强:10本\n')    
-file.write('李明:10本\n')
+with open(r'c:\book.txt','r',encoding='utf-8')as filel:
+    for data in filel:
+        if'小强:10本'in data:
+            print('小强数据在文件中')
+         if'小兰:12本'in data:
+            print('小强数据在文件中')