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 th

Answer 1

I like aix's solution best. here is another way I think should work in 2.2:

>>> x=range(3)
>>> x
[0, 1, 2]
>>> y=range(7,10)
>>> y
[7, 8, 9]
>>> sum(zip(x,y),[])
Traceback (most recent call last):
  File "", line 1, in 
TypeError: can only concatenate list (not "tuple") to list
>>> sum(map(list,zip(x,y)),[])
[0, 7, 1, 8, 2, 9]

and one more way:

>>> a=[x,y]
>>> [a[i][j] for j in range(3) for i in (0,1)]
[0, 7, 1, 8, 2, 9]

and:

>>> sum((list(i) for i in zip(x,y)),[])
[0, 7, 1, 8, 2, 9]