save project

diy.py

 with open(r'c:\Users\Administrator\Desktop\sales_list.txt','r',encoding='utf-8')as file:
     a=file.readlines()
+k=[]
 for i in a:   
     date=i.split() 
     sum=0
     for sales in date[1:]:
         sum=sum+int(sales)
-    w=date[0]+str(sum)
-    print(w)
+    w=date[0]+str(sum)+'\n'
+    k.append(w)
+with open(r'c:\Users\Administrator\Desktop\new_sales_list.txt','w',encoding='utf-8')as file:
+    file.writelines(k)