diy.py

with open(r'C:\Users\周周\Desktop\text.txt','r',encoding='utf-8') as file:
    a=file.readlines()
    print(a)
new_result=[]
for i in a:
    sum=0
    data=i.split()
    print(data)
    for sales in data[1:]:
        sum=sum+int(sales)
    result=data[0]+str(sum)+'\n'
    print(result)
    new_result.append(result)

with open(r'C:\Users\周周\Desktop\text.txt','w',encoding='utf-8') as file:
    file.writelines(new_result)