auto save

1.py

-with open(r'h:\桌面\sales_list.txt.txt','r',encoding='utf-8') as file:
+# with open (r'c:\Users\Administrator\Documents\lesson13-1\sales_list.txt','r',encoding='utf-8') as file:
+
+
+    # 这里可以直接把左侧的sales_list.txt拖到控制台，松手，就是它的路径了。
+# 打开文件有两种写法：
+# 方法一：
+# file=open(r'C:\Users\CM\Documents\lesson13-1\sales_list.txt','r',encoding='utf-8')
+# 方法二：（注意结尾的英文冒号）
+with open(r'C:\Users\CM\Documents\lesson13-1\sales_list.txt','r',encoding='utf-8') as 
+file:
+    
+# with openr('H:\桌面\sales_list.txt','r',encoding='utf-8')as 
+# file:
+a = file.read()
+print(type(a[3:5]))
     
     
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