diy.py

with open(r"c:\Users\GT\Documents\lesson13-1\sales_list.txt",'r',encoding='utf-8') as file:
    a=file.readlines()
    # print(a)
f_sum=[]
for i in a:
    # print(i)
    b=i.split()
    # print(b[0])
    # print(b[1:])
    sum=0
    for j in b[1:]:
        j=int(j)
        sum+=j
    c=b[0]+str(sum)+'\n'
    f_sum.append(c)
with open(r"c:\Users\GT\Documents\lesson13-1\all_sum.txt",'w',encoding='utf-8') as file1:
    file1.writelines(f_sum)