python文件内对应列相乘在求和

#!/env/bin/python
file = '/Users/{user}/code/test/lie_qiuhe.txt'
with open(file,'r',encoding='utf-8') as f:
    list = []
    for i in f:
        tmp = i.split(',')
#        print(float(tmp[1]))
        f1_tmp = float(tmp[0])
        f2_tmp = float(tmp[-1])
#        f1_tmp = int(tmp[1])
#        f2_tmp = int(tmp[-1])
        f_tmp = f1_tmp * f2_tmp
#        print(tmp[1],tmp[-1])
#        print(f_tmp)
        list.append(f_tmp)
    print(list)
    sum = 0
    for i in list:
        sum += i
    print(sum)

文件内容

1,1,1,1,1
0.3,0.5,0.3,0.5,1
1,1,3,3,1
1,1,1,1,1
1,1,1,1,1
1,3,3,6,2
1,5,1,5,1
1,1,1,1,1
1,1,1,1,1
2,5,5,10,1
1,1,1,1,1
3,3,4,10,3
1,1,1,1,1
1,1,2,20,1
0.5,1,5,30,1
1,1,1,1,1