[英]Create a Python List with Multiple Elements per Iteration
def f1(x): return [(x+1)*2-1, (x+1)*2-1]
def f2(x): return [(x+1)*2, (x+1)*2]
[[f1(i), f2(i)] for i in np.arange(3)]
This is the code to generate a list
of 3 list-pairs elements: 这是生成3个列表对元素的list
的代码:
[[[1, 1], [2, 2]], [[3, 3], [4, 4]], [[5, 5], [6, 6]]]
However, I would like to obtain a list
like below with one line of for
loop . 但是,我想获得像下面这样的list
, 其中包含一行for
循环 。
[[1, 1], [2, 2], [3, 3], [4, 4], [5, 5], [6, 6]]
This is how it works with multi-lines: 这就是多行的工作方式:
n = []
for i in np.arange(3):
n += [f1(i), f2(i)]
It's like trying to compose 2 elements per time where I don't know how to achieve +=
for one line of code. 就像每次尝试组成2个元素,而我不知道如何为一行代码实现+=
。 How can I do that? 我怎样才能做到这一点?
[x for i in np.arange(3) for x in [f1(i), f2(i)]]
使用具有两个for
子句的列表理解。
I could do something like this: 我可以做这样的事情:
[f1(i) for i in np.arange(3)] + [f2(i) for i in np.arange(3)]
But is there any better way? 但是还有更好的方法吗?
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