Interleave multiple lists of the same length in Python

Question

In Python, is there a good way to interleave two lists of the same length?

Say I'm given [1,2,3] and [10,20,30]. I'd like to transform those into [1,10,2,20,3,30].

Answer 1

Having posted the question, I've realised that I can simply do the following:

[val for pair in zip(l1, l2) for val in pair] 

where l1 and l2 are the two lists.

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If there are N lists to interleave, then

lists = [l1, l2, ...] [val for tup in zip(*lists) for val in tup]