hofer <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick
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