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'/Users/xujunheng/Desktop/test.txt','r',encoding='utf-8')
-a=file1.read()
-print(a)
+file1=open(r'/Users/xujunheng/Desktop/test.txt','a',encoding='utf-8')
+file1.write('小兰，12本\n')
+file1.write('小明，20本\n')
+file1.write('小刚，19本\n')
 file1.close()
-#with open(r'/Users/xujunheng/Desktop/test.txt','r',encoding='utf-8') as file1:
-    #file1.write('小k，19本\n')
\ No newline at end of file
+with open(r'/Users/xujunheng/Desktop/test.txt','a',encoding='utf-8') as file1:
+    file1.write('小k，19本\n')
\ No newline at end of file