On Monday 06 Dec 2004 09:26, Timothy Babytch wrote:
> Hi all.
>
> I have a list that looks like [['N', 'F'], ['E'], ['D']]
> I try to make it flat one: ['N', 'F', 'E', 'D']
>
> How can I archieve such an effect with list comprehension?
> Two cycles did the job, but that way did not look pythonic..
>
> I tried
> print [x for x in y for y in c_vars]
> and got NameError: name 'y' is not defined.
>
> --
> Timothy Babytch
Hi,
I think you do it with a generator like this:
def flatten(nested):
for sublist in nested:
for element in sublist:
yield element
n=[['N', 'F'], ['E'], ['D']]
output=[]
for value in flatten(n):
output.append(value)
print output
Have a merry Christmas
Peter Nuttall
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