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.write('小丽:11本')
+#file1.write('李文:11本')
+#file1.write('张伟:16本')
+#file1.close()
+
+#file1=(r'C:\Users\Administrator\Desktop\test.txt','a',encoding='utf-8')
+#file1.write('小强:12本\n')
+#file1.write('李明:15本\n')
+#file1.cloes()
+
+with open=(r'C:\Users\Administrator\Desktop\test.txt','a',encoding='utf-8')as file1:
+    for i in fiel:
+        if'小强=10本'in i:
+            print ('数据在文件中')