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Re: dummy, underscore and unused local variables

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  Re: dummy, underscore and unused local variables Chris Angelico <rosuav@gmail.com> - 2011-06-14 01:55 +1000
    Re: dummy, underscore and unused local variables Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-06-13 16:15 +0000
      Re: dummy, underscore and unused local variables Chris Angelico <rosuav@gmail.com> - 2011-06-14 02:41 +1000

#7527 — Re: dummy, underscore and unused local variables

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)
>  |  bool(x) -> bool
>  ......
>  I'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

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#7531

On Tue, 14 Jun 2011 01:55:04 +1000, Chris Angelico wrote:

> 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)
>>  |  bool(x) -> bool
>>  ......
>>  I'd welcome comments on this as well.
> 
> _ is special to IDLE.

Not just IDLE. Also the vanilla Python command line interpreter. In fact, 
you can even find the code that controls it:

help(sys.displayhook)

http://docs.python.org/library/sys.html#sys.displayhook



-- 
Steven

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#7535

On Tue, Jun 14, 2011 at 2:15 AM, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> wrote:
> On Tue, 14 Jun 2011 01:55:04 +1000, Chris Angelico wrote:
>> _ is special to IDLE.
>
> Not just IDLE. Also the vanilla Python command line interpreter. In fact,
> you can even find the code that controls it:

Sorry, my bad! I should have said "to the Python interactive
interpreter", the code that backs IDLE and the command line
interpreter. But in any case, it's a feature of the interactive that
doesn't apply to scripts.

ChrisA

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