Joel Koltner wrote:
Is there an easy way to get a list comprehension to produce a flat list of,
say, [x,2*x] for each input argument?
E.g., I'd like to do something like:
[ [x,2*x] for x in range(4) ]
...and receive
[ 0,0,1,2,2,4,3,6]
...but of course you really get a list of lists:
[[0, 0], [1, 2], [2, 4], [3, 6]]
I'm aware I can use any of the standard "flatten" bits of code to turn this
back into what I want, but I was hoping there's some way to avoid the "lists
of lists" generation in the first place?
A slightly similar problem: If I want to "merge," say, list1=[1,2,3] with
list2=[4,5,6] to obtain [1,4,2,5,3,6], is there some clever way with "zip" to
do so?
Thanks,
---Joel
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For the first part:
def gen(n):
for i in xrange(n):
yield i
yield 2*i
print list(gen(4))
[0, 0, 1, 2, 2, 4, 3, 6]
gerard
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