save project

diy.py

 with open(r"C:\Users\windows\Documents\lesson13-1\sales_list.txt","r",encoding="utf-8") as file:
     a = file.readlines()
-
+    #空列表
+    list = []
 for i in a:
     data = i.split()
     #print(data)
     sum = 0
-    for sales in data[1:]:
-        sum = sum+int(sales)
-    result = data[0]+str(sum)
-    print(result)
\ No newline at end of file
+    for n in data[1:]:
+        sum = sum+int(n)
+    s = data[0]+str(sum)+"\n"
+    print(s)
+    list.append(s)
+with open(r"C:\Users\windows\Documents\lesson13-1\sum.txt","w",encoding="utf-8") as file:
+    file.writelines()
\ No newline at end of file