diy.py

with open(r'C:\Users\Admin\Desktop\sales_list.txt','r',encoding='utf-8') as file:
    a =file.readlines()


for i in a:
    date=i.split()
    sum = 0
    for sales in date[1:]:
        sum = sum +int(sales)
    result = date[0]+str(sum)
    print(result)