diy.py

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