save project

diy4.py

 filel=open(r'C:\Users\Administrator\Desktop\test.txt','w',encoding='utf-8')
-filel.write('小兰:12本')
-filel.write('小丽:11本')
-filel.write('李文:9本')
-filel.write('张伟:16本')
+filel.write('小兰:12本\n')
+filel.write('小丽:11本\n')
+filel.write('李文:9本\n')
+filel.write('张伟:16本\n')
 filel.close()
 file=open(r'C:\Users\Administrator\Desktop\test.txt','a',encoding='utf-8')
 file.write('小兰:1200本\n')
 file.close()
+with open(r'C:\Users\Administrator\Desktop\test.txt','r',encoding='utf-8')as filel:
+    for data in filel:
+        if '小强:10本'in data:
+            print('数据在文件中')
\ No newline at end of file