auto save

diy.py

-list=[]    
-with open(r'C:\Users\yd\Documents\lesson13-1\sales_list.txt','r',encoding='utf-8') as f1:
-    data = f1.readlines()     #返回数据列表
-    for i in data:             #对数据列表进行遍历
-        new_data = i.split()        #对列表中的元素（字符串）进行分割，并且生成一个列表
-        #print(new_data[1:])       #打印该列表除第一项以外的其他项
-        sum = 0                    #  设置求和变量
-        for j in new_data[1:]:     #利用for循环遍历，累加求和存入sum中
-            sum = sum+int(j)        #注意j的数据类型为字符串
-        list.append(new_data[0]+str(sum)+'\n') #将姓名new_data[0]和总分sum以及换行符保存到列表中
-with open(r'C:\Users\yd\Documents\lesson13-1\sales_list1.txt','a',encoding='utf-8') as f2:
-    f2.writelines(list)     #利用追加模式在（新建的文件）中写入，利用writelines方法写入，里面的参数是列表
+list = []
+with open(r'c:\Users\yd\Documents\lesson13-1\sales_list.txt','r',encoding='utf-8') as f1:
+    data = f1.readlines()
+    for i in data:
+        A=i.split()
+        sum = 0
+        for j in A[1:]:
+            sum = sum +int(j)
+        result = A[0] + str(sum) +'\n'
+        list.append(result)
+with open(r'c:\Users\yd\Documents\lesson13-1\sales_list1.txt','w',encoding='utf-8') as f2:
+    f2.writelines(list)