list of 'magic methods' or builtin class methods... want to exclude those from dir output

[Terry Reedy]

DG wrote:
> There is probably a better way to do this (please enlighten me, if you
> know), but what I want to do is get a list of a class' attributes
> minus whatever the 'builtin' methods are.  I would also like to do
> this for instances of classes as well.  I don't want to use __dict__
> because I want to get all of the attributes that have been added
> throughout the inheritance tree, just not the builtin ones.
> 
> I was wondering if there is a function to return a list of these, so I
> could perform a 'dir' on the object (class or instance) and filter out
> the builtin attributes.  I know I could create my own list something
> like
> ['__class__', '__delattr__', ..., '__weakref__'] and use that.  I
> would see this being fragile to Python version differences as new ones
> are added or taken away.
> 
> A more flexible way is to have the list be filled out dynamically by
> creating a 'junk' class that inherits only from object and storing
> it's dir() output into the filter list.  This is probably what I'll do
> unless someone knows of a builtin function that will give me a
> (version-safe) list.
> 
> Thanks!
3.1
 >>> list(filter(lambda s: s[0:2]!='__', dir(object)))
[]

Now substitute your object for lambda. This assumes of course that you 
are doing no name-mangling __xxx names.

tjr