unpack tuple of wrong size

[Tung Wai Yip]

I want to do

t = (1,2)
a,b = t # get a=1 and b=2

However when
t = (1,)
a,b=t

I got a "ValueError : unpack tuple of wrong size"

What I want is for a=1 and b=None. Is there a good way to do this?


Wai Yip Tung

[Andres Rosado-Sepulveda]

Re: unpack tuple of wrong size

Tung Wai Yip wrote:
[color=blue]
> I want to do
>
> t = (1,2)
> a,b = t # get a=1 and b=2
>
> However when
> t = (1,)
> a,b=t
>
> I got a "ValueError : unpack tuple of wrong size"
>
> What I want is for a=1 and b=None. Is there a good way to do this?[/color]

t = (1,None)
a,b = t

(1,) means that the tuple has only one element. Remember that tuples are
defined by the comma, except on those cases where it would be unclear
what the intention is.

--
Andres Rosado
Email: andresr@despamm ed.com
Homepage: http://andres980.tripod.com/

"Well, well. Look-who's-BACK!"
-- Megatron

[Duncan Booth]

Re: unpack tuple of wrong size

Tung Wai Yip <tungwaiyip@yah oo.com> wrote in
news:c7r57095as sq7p777q2ugudnh 72qud8kgb@4ax.c om:
[color=blue]
> However when
> t = (1,)
> a,b=t
>
> I got a "ValueError : unpack tuple of wrong size"
>
> What I want is for a=1 and b=None. Is there a good way to do this?[/color]

Probably the simplest is:

a, b = (t + (None, None))[:2]