__dir__

[Jacek Generowicz]

Is there some way of affecting the way dir finds the information it presents?

For example, supposing a hypothetical __dir__ magic method:

class collection:
def __init__(self, myname, names):
self.names = names
self.myname = myname
def __dir__(self):
return ['%s(%s)' % (self.myname,n) for n in self.names]

class thingy:
def __init__(self, *names):
self.it = collection('it' , names)

thing = thingy('this', 'that', 'theother')

dir(thing)

['__doc__', '__init__', '__module__', 'it(this)', 'it(that)', 'it(theother)']


In other words, I would like some attributes of an instance to inject
some information into the output of dir ... to change the way their
names are perceived by dir.

Any ideas ?

[Peter Otten]

Re: __dir__

Jacek Generowicz wrote:
[color=blue]
> Is there some way of affecting the way dir finds the information it
> presents?
>
> For example, supposing a hypothetical __dir__ magic method:
>
> class collection:
> def __init__(self, myname, names):
> self.names = names
> self.myname = myname
> def __dir__(self):
> return ['%s(%s)' % (self.myname,n) for n in self.names]
>
> class thingy:
> def __init__(self, *names):
> self.it = collection('it' , names)
>
> thing = thingy('this', 'that', 'theother')
>
> dir(thing)
>
> ['__doc__', '__init__', '__module__', 'it(this)', 'it(that)',
> ['it(theother)']
>
>
> In other words, I would like some attributes of an instance to inject
> some information into the output of dir ... to change the way their
> names are perceived by dir.
>
> Any ideas ?[/color]
[color=blue][color=green][color=darkred]
>>> class C:[/color][/color][/color]
.... __members__ = ["Is this evil?", "So what"]
....[color=blue][color=green][color=darkred]
>>> dir(C)[/color][/color][/color]
['__doc__', '__members__', '__module__'][color=blue][color=green][color=darkred]
>>> dir(C())[/color][/color][/color]
['Is this evil?', 'So what', '__doc__', '__members__', '__module__'][color=blue][color=green][color=darkred]
>>>[/color][/color][/color]

However, __members__ is marked as deprecated and, even more important, I
don't know what the side effects of the above may be.
Highly unrecommended.

Peter

[Jacek Generowicz]

Re: __dir__

Peter Otten <__peter__@web. de> writes:
[color=blue]
> However, __members__ is marked as deprecated and, even more important, I
> don't know what the side effects of the above may be.
> Highly unrecommended.[/color]

Great, sounds just perfect for my needs ;-)