a few extensions for the itertools

[Duncan Booth]

Mathias Panzenboeck <e0427417 at student.tuwien.ac.at> wrote:

> take(n,iterable) -> iterator
>      returns a iterator over the first n
>      elements of the iterator

Isn't this just the same as itertools.islice(iterable, n) ?

> drop(n,iterable) -> iterable
>      drops the first n elemetns of iterable and
>      return a iterator over the rest

and this looks to be the same as itertools.islice(iterable, n, None)

Can you give use cases for 'heads' and 'tails'? I'm curious why you would 
want them.