list comprehension namespace problem

[Frank Millman]

On 2020-09-25 7:46 AM, Chris Angelico wrote:
> On Fri, Sep 25, 2020 at 3:43 PM Frank Millman <frank at chagford.com> wrote:
>>
>> Hi all
>>
>> I have a problem related (I think) to list comprehension namespaces. I
>> don't understand it enough to figure out a solution.
>>
>> In the debugger, I want to examine the contents of the current instance,
>> so I can type
>>
>>       (Pdb) dir(self)
>>
>> and get the result with no problem.
>>
>> However, it is a long list containing attribute names and method names,
>> and I only want to see the attribute names. So I tried this -
>>
>>       (Pdb) [x for x in dir(self) if not callable(getattr(self, x))]
>>       *** NameError: name 'self' is not defined
>>       (Pdb)
>>
>> Q1. Can someone explain what is going on?
>>
>> Q2. Is there a way to get what I want?
>>
> 
> If you put that line of code into your actual source code, does it
> work? I think this might be a pdb-specific issue, since normally the
> comprehension should have no difficulty seeing names from its
> surrounding context.
> 
> A minimal case will probably involve the debugger and a function with
> a local, unless in some way this depends on 'self' being special.
> 

Yes, is does work from within my source code.

Frank