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'
+file1=open(r'C:\Users\Administrator\Desktop\test.txt','w',encoding='utf-8')
+file1.write('小兰；12本')
+file1.close()
+with open(r'C:\Users\Administrator\Desktop\test.txt','a',encoding='utf-8') as file1:
+    file.write('李强；10本\n')
+with open(r'C:\Users\Administrator\Desktop\test.txt','r',encoding='utf-8') as file1:
+    for data in file1:
+        if '李强；10本' in data:
+            print('数据在文件中')
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