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'
+with open(r'c:\Users\17830\Desktop\test.txt','w',encoding='utf-8') as file:#write  只写
+    file.write('小兰 12本\n')
+    file.write('小丽 11本\n')
+    file.write('李文 12本\n')
+    file.write('张伟 16本\n')
+#追加李强  15本  李三 17本
+with open(r'c:\Users\17830\Desktop\test.txt','a',encoding='utf-8') as file:#append 追加
+    file.write('李强  15本\n')
+    file.write('李三  17本\n')
+#在控制台显示test.txt文本中存储的数据
+with open(r'c:\Users\17830\Desktop\test.txt','r',encoding='utf-8') as file:#只读操作
+    a=file.read()
+    print(a)
+#判断小丽 11本 是否在文本中
+with open(r'c:\Users\17830\Desktop\test.txt','r',encoding='utf-8') as file:
+    for i in file:
+        if "小丽 11本" in i:
+            print('数据存在')