Argument of the bool function

[Thomas Rachel]

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.