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Re: Class: @property -> .__dict__

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Ulrich wrote:

> if I replace it to
> def attributelist(self):
>          # find all attributes to the class that are of type numpy
> arrays:
>          return [attr for attr in dir(self) if
> isinstance(getattr(self, attr), numpy.ndarray)]
> 
> it crashes going into some kind of endless loop.
> 
> Do you happen to have any idea?

dir(self) finds an attribute named "attributelist", getattr(self, 
"attributelist") then tries to calculate the value of that attribute, 
invokes dir(self) which finds an attribute named "attributelist" and so on 
ad infinitum or the stack overflows. Try (untested)

@property
def attributelist(self):
    return [attr for attr in dir(self) if attr != "attributelist" and
            isinstance(getattr(self, attr), numpy.ndarray)]

to avoid the infinite recursion.

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Class: @property -> .__dict__ Ulrich <ulrich@dorda.net> - 2011-12-16 00:52 -0800
  Re: Class: @property -> .__dict__ Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-16 09:03 +0000
    Re: Class: @property -> .__dict__ Ulrich <ulrich.dorda@gmail.com> - 2011-12-16 01:11 -0800
      Re: Class: @property -> .__dict__ Ulrich <ulrich.dorda@gmail.com> - 2011-12-16 01:14 -0800
        Re: Class: @property -> .__dict__ Peter Otten <__peter__@web.de> - 2011-12-16 10:32 +0100
        Re: Class: @property -> .__dict__ Ian Kelly <ian.g.kelly@gmail.com> - 2011-12-16 09:23 -0700
  Re: Class: @property -> .__dict__ Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2011-12-16 11:02 +0100

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