diy.py

with open(r"C:\Users\Administrator\Documents\lesson13-1\sales_list.txt","r",encoding="utf-8") as file1:
    text=file1.readlines()
    # print(text)
for i in text:
    date=i.split()
    sum=0
    for a in date[0:]:
        sum=sum+int(a)
        c=date[0]+str[sum]
    print(c)