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Date: Tue, 14 Jun 2011 01:55:04 +1000
Subject: Re: dummy, underscore and unused local variables
From: Chris Angelico <rosuav@gmail.com>
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:7527

On Tue, Jun 14, 2011 at 1:37 AM, Tim Johnson <tim@johnsons-web.com> wrote:
> On a related note: from the python interpreter if I do
>>>> help(_)
> I get
> Help on bool object:
>
> class bool(int)
> =A0| =A0bool(x) -> bool
> =A0......
> =A0I'd welcome comments on this as well.

_ is special to IDLE.


>>> 1+2
3
>>> _
3

It's the last result. So presumably when you did it, your last result
was something boolean.

>>> sorted([random.randint(1,10) for i in range(10)])
[1, 1, 2, 3, 4, 4, 5, 7, 8, 10]
>>> set(_)
{1, 2, 3, 4, 5, 7, 8, 10}

Can be quite handy, if you remember it's there. Otherwise, not so much. :)

Chris Angelico