unpacking vars from list of tuples

Ross rossgk at gmail.com
Wed Sep 16 00:31:31 CEST 2009


On Sep 15, 6:00 pm, Andre Engels <andreeng... at gmail.com> wrote:
> On Tue, Sep 15, 2009 at 11:51 PM, Ross <ros... at gmail.com> wrote:
> > I'm inexperienced with some of the fancy list slicing syntaxes where
> > python shines.
>
> > If I have a list of tuples:
>
> >   k=[("a", "bob", "c"), ("p", "joe", "d"), ("x", "mary", "z")]
>
> > and I want to pull the middle element out of each tuple to make a new
> > list:
>
> > myList = ["bob", "joe", "mary"]
>
> > is there some compact way to do that?  I can imagine the obvious one
> > of
>
> > myList = []
Thanks both Chris and André. That's quite obvious once it's pointed
out for me.  Thanks especially for the terminology that will make
learning the related concepts a bit easier.

Ross


> > for a in k:
> >   myList.append(a[1])
>
> > But I'm guessing Python has something that will do that in one line...
>
> > Any suggestion is appreciated...
>
> You can use a list comprehension:
>
> myList = [a[1] for a in k]
>
> --
> André Engels, andreeng... at gmail.com




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