Python 在列表中执行计算

Question

I have this list [9,4,5] I want to multiply each element by 2 then I sum the result I will get 9*2=18,4*2=8,5*2=10 then I sum 18+8+10=36

Can you guys help me to write this please

Answer 1

There is no need to multiply each element by 2; just multiply the whole sum by 2 afterwards.

>>> data = [9, 4, 5]
>>> 2 * sum(data)
36

Answer 2

sum()和列表理解

sum([x*2 for x in your_list])

Answer 3

You can use sum and a generator expression:

>>> data = [9,4,5]
>>> sum(n*2 for n in data)
36