Sum of corresponding column multiplication in Python file

#!/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)

The contents of the document

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