save project

diy.py

 with open (r"c:\Users\Windows 10\Documents\lesson13-1\sales_list.txt","r",encoding="utf-8") as file:
     list=file.readlines()
+wl=[]
 for i in list:
     data = i.split()
     sum = 0
     for j in data[1:]:
         sum+=int(j)
-    result = data[0]+str(sum)
-    print(result)
-
-
+    result = data[0]+str(sum)+"\n"
+    wl.append(result)
+with open (r"c:\Users\Windows 10\Documents\lesson13-1\sales_list.txt","a",encoding="utf-8") as file:
+    file.writelines(wl)