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'
 #file=open(r'C:\Users\Public\Desktop\test.txt','a',encoding='utf-8')
-with open(r'C:\Users\Public\Desktop\test.txt','r',encoding='utf-8') as file:
-    # file.write('小兰:12本\n')
-    # file.write('小丽:11本\n')
+with open(r'C:\Users\Public\Desktop\test.txt','w',encoding='utf-8') as file:
+    file.write('小兰:12本\n')
+    file.write('小丽:11本\n')
     # file.write('李文:9本\n')
     # file.write('张伟:16本\n')
     # a=file.read()
     # print(a)
-    for data in file:
-        if"张伟:16本"in data:
-            print('在')
\ No newline at end of file
+    # for data in file:
+    #     if"张伟:16本"in data:
+    #         print('在')
+    a=file.write(new_data)
+with open(r'C:\Users\Public\Desktop\test.txt','w',encoding='utf-8') as file:
+    a=file.read()
+    print(a)
\ No newline at end of file