Appending a list's elements to another list using a list comprehension

[Carsten Haese]

On Wed, 2007-10-17 at 20:27 +0000, Debajit Adhikary wrote:
> I have two lists:
> 
> a = [1, 2, 3]
> b = [4, 5, 6]
> 
> What I'd like to do is append all of the elements of b at the end of
> a, so that a looks like:
> 
> a = [1, 2, 3, 4, 5, 6]
> 
> I can do this using
> 
> map(a.append, b)
> 
> How do I do this using a list comprehension?

You don't.

> (In general, is using a list comprehension preferable (or more
> "pythonic") as opposed to using map / filter etc.?)

In general, a list comprehension is more Pythonic nowadays, but in your
particular case the answer is neither map nor a list comprehension, it's
this:

a += b

HTH,

-- 
Carsten Haese
http://informixdb.sourceforge.net