在Python中生成一个偶数列表 [英] Generating a list of EVEN numbers in Python

问题描述

基本上，我需要帮助从我在Python中创建的列表中生成偶数:

Basically I need help in generating even numbers from a list that I have created in Python:

[1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, 17711, 28657, 46368, ...]

我尝试了几种不同的方法，但是每次打印时，偶数中都混有奇数！

I have tried a couple different methods, but every time I print, there are odd numbers mixed in with the evens!

我知道如何在0到100的范围内生成偶数/奇数，但是，我很难从前面提到的列表中获取偶数！

I know how to generate even/odd numbers if I were to do a range of 0-100, however, getting only the even numbers from the previous mentioned list has me stumped!

P.S.我只使用python几天，如果事实证明这非常简单，请提前感谢！

P.S. I've only been using python for a couple days, if this turns out to be extremely simple, thanks in advance!

感谢您的所有答复，在您的帮助下，我已经解决了这个小问题.这是我最后要完成的一些练习，要求对斐波那契数列的偶数求和:

Thanks for all the replies, with your help I've gotten through this little problem. Here is what I ended up with to complete a little excercise asking to sum the even numbers of fibonacci sequence:

F = [1, 2]
while F[-1] < 4000000
    F.append(F[-1] + F[-2])

sum(F[1::3])
4613732

推荐答案

使用列表理解(请参阅:

Use a list comprehension (see: Searching a list of objects in Python)

myList = [<your list>]
evensList = [x for x in myList if x % 2 == 0]

这很好，因为它使列表完整无缺，并且您可以将evensList用作普通列表对象.

This is good because it leaves list intact, and you can work with evensList as a normal list object.

希望这会有所帮助！

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