auto save

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'
+f1=open(r'C:\Users\Administrator\Desktop\lz.txt','w',encoding='utf-8')
+f1.write('小兰:12') 
+f1.write('小丽:11')
+f1.write('李文:9')
+f1.write('张伟:16')
+f1.write('小强:10\n')
+f1.write('李明:15\n')
+
+with open(r'C:\Users\Administrator\Desktop\lz.txt','r',encoding='utf-8')as f1:
+    for i in f1:
+        if '小强:10' in i:
+            print('小强在文件中')
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