Re: Argument of the bool function

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From	Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de>
Newsgroups	comp.lang.python
Subject	Re: Argument of the bool function
Date	Mon, 25 Apr 2011 16:29:34 +0200
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Am 10.04.2011 18:21, schrieb Mel:
> Chris Angelico wrote:
>
>> Who would use keyword arguments with a function that takes only one arg
>> anyway?
>
> It's hard to imagine.  Maybe somebody trying to generalize function calls
> (trying to interpret some other language using a python program?)
>
> # e.g. input winds up having the effect of ..
> function = bool
> name = 'x'
> value = 'the well at the end of the world'
> ## ...
> actions.append ((function, {name:value}))
> ## ...
> for function, args in actions:
>      results.append (function (**args))

Wrong structure.

Better do

function = bool
value = 'the well at the end of the world'
## ...
actions.append((function, (value,), {}))
## ...
for function, args, kwargs in actions:
      results.append(function(*args, **kwargs))

or maybe even better (taking care for closures):

function = bool
value = 'the well at the end of the world'
## ...
actions.append(lambda val=value: function(val))
## ...
for function in actions:
      results.append(function())


>
> Not something I, for one, do every day.  But regularity in a language is
> good when you can get it, especially for abstract things like that.
>
> I can sort of guess that `dir` was perhaps coded in C for speed and doesn't
> spend time looking for complicated argument lists.
>
> Python is a pragmatic language, so all the rules come pre-broken.
>
>
> 	Mel.

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Re: Argument of the bool function Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2011-04-25 16:29 +0200
  Re: Argument of the bool function Chris Angelico <rosuav@gmail.com> - 2011-04-26 05:33 +1000
    Re: Argument of the bool function Paul Rubin <no.email@nospam.invalid> - 2011-04-25 16:26 -0700
      Re: Argument of the bool function Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-04-26 02:38 +0000
  Re: Argument of the bool function Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2011-04-25 23:28 +0200
    Re: Argument of the bool function Ian Kelly <ian.g.kelly@gmail.com> - 2011-04-25 17:44 -0600

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