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

[DG]

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!

 

[DG]

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!

Haha, replying to my own post. Here is the implementation of my idea
of dynamically creating the filter lists from a 'junk' object. As of
now it appears that the dir output of a class is the same as the dir
output of an instance, but if that ever changes, this should future
proof it. This is only a 4-liner, so it is probably good enough for
what I want to do, but I would rather use a builtin/standard way if
there is one.

class A(object):
pass
class_filter_methods = dir(A)
instance_filter_methods = dir(A())

 

[DG]

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!

Haha, replying to my own post.  Here is the implementation of my idea
of dynamically creating the filter lists from a 'junk' object.  As of
now it appears that the dir output of a class is the same as the dir
output of an instance, but if that ever changes, this should future
proof it.  This is only a 4-liner, so it is probably good enough for
what I want to do, but I would rather use a builtin/standard way if
there is one.

class A(object):
    pass
class_filter_methods = dir(A)
instance_filter_methods = dir(A())

Wow, I'm a quick one. Sharp as a marble. 2-liner:

class_filter_methods = dir(object)
instance_filter_methods = dir(object())

 

[Terry Reedy]

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