auto save

diy.py

+#打开文件的两种方法
+#方法1
+with open(r'C:\Users\HP\Desktop\bell\文件读写\book.txt','r',encoding='utf-8') as file:
+#方法二
+file=open(r'C:\Users\HP\Desktop\bell\文件读写\book.txt','r',encoding='utf-8')
+#file.close()
+
+#在第一个的基础上，修改
+with open(r'C:\Users\HP\Desktop\bell\文件读写\book.txt','r',encoding='utf-8') as file:
+    a=file.readlines()
+for i in a:#用for...in...将每一行的数据遍历一边
+    print(i)
+