auto save

diy.py

@@ -4,6 +4,9 @@ file1.write('小丽：11本\n')
 file1.write('李文：9本\n')
 file1.write('张伟：16本\n')
 file1.close()
-with open(r'C:\Users\HP\Desktop\bell\文件读写\book.txt','w',encoding='utf-8') as file1:
+with open(r'C:\Users\HP\Desktop\bell\文件读写\book.txt','a',encoding='utf-8') as file1:
     file1.write('小强：12本\n')
-    file1.write('李明：11本\n')
\ No newline at end of file
+    file1.write('李明：11本\n')
+with open(r'C:\Users\HP\Desktop\bell\文件读写\book.txt','r',encoding='utf-8') as file1:
+    for data in file1:
+        print(data)
\ No newline at end of file