dict slice in python (translating perl to python)

[Nick Craig-Wood]

hofer <blabla at dungeon.de> wrote:
>  Let's take following perl code snippet:
> 
>  %myhash=( one  => 1    , two   => 2    , three => 3 );
>  ($v1,$v2,$v3) = @myhash{qw(one two two)}; # <-- line of interest
>  print "$v1\n$v2\n$v2\n";
> 
>  How do I translate the second line in a similiar compact way to
>  python?
> 
>  Below is what I tried. I'm just interested in something more compact.
> 
>  mydict={ 'one'   : 1    , 'two'   : 2    , 'three' : 3 }
>  # first idea, but still a little too much to type
>  [v1,v2,v3] = [ mydict[k] for k in ['one','two','two']]
> 
>  # for long lists lazier typing,but more computational intensive
>  # as  split will probably be performed at runtime and not compilation
>  time
>  [v1,v2,v3] = [ mydict[k] for k in 'one two two'.split()]

As an ex-perl programmer and having used python for some years now,
I'd type the explicit

  v1,v2,v3 = mydict['one'], mydict['two'], mydict['two'] # 54 chars

Or maybe even

  v1 = mydict['one'] # 54 chars
  v2 = mydict['two']
  v3 = mydict['two']

Either is only a couple more characters to type.  It is completely
explicit and comprehensible to everyone, in comparison to

  v1,v2,v3 = [ mydict[k] for k in ['one','two','two']] # 52 chars
  v1,v2,v3 = [ mydict[k] for k in 'one two two'.split()] # 54 chars

Unlike perl, it will also blow up if mydict doesn't contain 'one'
which may or may not be what you want.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick