Re: getting all user defined attributes of a class
On Feb 7, 1:42 pm, Amit Gupta <[EMAIL PROTECTED]> wrote:
> Thanks. What I found is: If I call iterate over the __dict__ of the
> instance of the class, I only get user-atttributes and not built-in
> attributes. I have an instance of that class, anyway, so this will do.
> However, I wonder if I am getting just lucky and this might change in
> future. In that regard the solution provides by all posters above
> might well be more robust.
Instances and classes have separate namespaces:
class X(object):
x = 1
def __init__(self):
self.y = 2
>>> X().__dict__
{'y': 2}
>>> X.__dict__
>>> X.__dict__.items()
[('__module__', '__main__'),
('__dict__', ),
('x', 1),
('__weakref__', ),
('__doc__', None),
('__init__', )]
And neither of those includes attributes defined in superclasses,
classes with __slots__, pseudo-attributes through __getattr__ and
possibly more I've missed.
George
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Re: getting all user defined attributes of a class
On Feb 7, 12:28 am, grflanagan <[EMAIL PROTECTED]> wrote: > On Feb 6, 11:07 pm, Amit Gupta <[EMAIL PROTECTED]> wrote: > > > Hi > > > How do I get user defined attributes of a class? e.g > > > Class A(object) : > > self.x = 1 > > -- > > > I want something like: > > for userattrib in A.getAllUserAttribute() : > > print userattrib [..] > > HTH > > Gerard Thanks. What I found is: If I call iterate over the __dict__ of the instance of the class, I only get user-atttributes and not built-in attributes. I have an instance of that class, anyway, so this will do. However, I wonder if I am getting just lucky and this might change in future. In that regard the solution provides by all posters above might well be more robust. A -- http://mail.python.org/mailman/listinfo/python-list
Re: getting all user defined attributes of a class
On Feb 6, 11:07 pm, Amit Gupta <[EMAIL PROTECTED]> wrote: > Hi > > How do I get user defined attributes of a class? e.g > > Class A(object) : > self.x = 1 > -- > > I want something like: > for userattrib in A.getAllUserAttribute() : > print userattrib > class Meta(type): def __init__(cls, name, bases, attrs): super(Meta, cls).__init__(name, bases, attrs) cls._attrs = attrs.keys() class Base(object): __metaclass__ = Meta def getmembers(self): return [k for k in self.__dict__ if k not in self._attrs] class MyObj(Base): def __init__(self): self.a = 1 self.b = 2 obj = MyObj() print obj.getmembers() ['a', 'b'] setattr(obj, 'c', 3) print obj.getmembers() ['a', 'c', 'b'] HTH Gerard -- http://mail.python.org/mailman/listinfo/python-list
Re: getting all user defined attributes of a class
On Wed, 06 Feb 2008 15:16:26 -0800, Amit Gupta wrote:
> On Feb 6, 2:55 pm, "Diez B. Roggisch" <[EMAIL PROTECTED]> wrote:
>> Amit Gupta schrieb:
>> > I should make class A as:
>> > class A (object) :
>> > x = 1
>>
>> > Now, x is class attribute and I am looking for some-way to filter non-
>> > user-defined attributes.
>>
>> > e.g.g if I do
>> > for attr in a.__dict__ :
>> > print attr
>>
>> > I will also get
>>
>> > __module__, __weakref__ and others including "x"
>>
>> Just create an empty class, gather all attribute names from that and
>> then subtract that set of names from the names you get from a "real" class.
>>
>> Dize
>
> Fine. This is a hack. I am looking if python language itself provides
> any built-in function for this. E.g.:
Why is that a hack!? What about:
In [369]: def is_special_name(name):
.: return name.startswith('__') and name.endswith('__')
.:
In [370]: filter(lambda m: not is_special_name(m[0]), inspect.getmembers(A))
Out[370]: [('x', 1)]
> When I do help on some built-in function, it displays that function is
> built_in. Can that information get accessed using a function? (now,
> don't ask me to store help-output in buffer and grep for built-in).
Yes but it is not built-in. Have a look at the `inspect` module.
What's the use case?
Ciao,
Marc 'BlackJack' Rintsch
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Re: getting all user defined attributes of a class
On Feb 6, 2:55 pm, "Diez B. Roggisch" <[EMAIL PROTECTED]> wrote: > Amit Gupta schrieb: > > > > > On Feb 6, 2:15 pm, Marc 'BlackJack' Rintsch <[EMAIL PROTECTED]> wrote: > >> On Wed, 06 Feb 2008 14:07:23 -0800, Amit Gupta wrote: > >>> Class A(object) : > >>> self.x = 1 > >> This is not valid Python code. > > >>> I want something like: > >>> for userattrib in A.getAllUserAttribute() : > >>> print userattrib > >>> My question is, is there a builtin function, called > >>> getAllUserAttributes? > >> No and there can't be since the attributes you seem to be interested in > >> don't exist until an instance is created. > > >> Ciao, > >> Marc 'BlackJack' Rintsch > > > My mistake: > > > I should make class A as: > > class A (object) : > > x = 1 > > > Now, x is class attribute and I am looking for some-way to filter non- > > user-defined attributes. > > > e.g.g if I do > > for attr in a.__dict__ : > > print attr > > > I will also get > > > __module__, __weakref__ and others including "x" > > Just create an empty class, gather all attribute names from that and > then subtract that set of names from the names you get from a "real" class. > > Dize Fine. This is a hack. I am looking if python language itself provides any built-in function for this. E.g.: When I do help on some built-in function, it displays that function is built_in. Can that information get accessed using a function? (now, don't ask me to store help-output in buffer and grep for built-in). A -- http://mail.python.org/mailman/listinfo/python-list
Re: getting all user defined attributes of a class
Amit Gupta schrieb: > On Feb 6, 2:15 pm, Marc 'BlackJack' Rintsch <[EMAIL PROTECTED]> wrote: >> On Wed, 06 Feb 2008 14:07:23 -0800, Amit Gupta wrote: >>> Class A(object) : >>> self.x = 1 >> This is not valid Python code. >> >>> I want something like: >>> for userattrib in A.getAllUserAttribute() : >>> print userattrib >>> My question is, is there a builtin function, called >>> getAllUserAttributes? >> No and there can't be since the attributes you seem to be interested in >> don't exist until an instance is created. >> >> Ciao, >> Marc 'BlackJack' Rintsch > > My mistake: > > I should make class A as: > class A (object) : > x = 1 > > Now, x is class attribute and I am looking for some-way to filter non- > user-defined attributes. > > e.g.g if I do > for attr in a.__dict__ : > print attr > > > I will also get > > __module__, __weakref__ and others including "x" Just create an empty class, gather all attribute names from that and then subtract that set of names from the names you get from a "real" class. Dize -- http://mail.python.org/mailman/listinfo/python-list
Re: getting all user defined attributes of a class
On Feb 6, 2:15 pm, Marc 'BlackJack' Rintsch <[EMAIL PROTECTED]> wrote: > On Wed, 06 Feb 2008 14:07:23 -0800, Amit Gupta wrote: > > Class A(object) : > > self.x = 1 > > This is not valid Python code. > > > I want something like: > > for userattrib in A.getAllUserAttribute() : > > print userattrib > > > My question is, is there a builtin function, called > > getAllUserAttributes? > > No and there can't be since the attributes you seem to be interested in > don't exist until an instance is created. > > Ciao, > Marc 'BlackJack' Rintsch My mistake: I should make class A as: class A (object) : x = 1 Now, x is class attribute and I am looking for some-way to filter non- user-defined attributes. e.g.g if I do for attr in a.__dict__ : print attr I will also get __module__, __weakref__ and others including "x" Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: getting all user defined attributes of a class
On Wed, 06 Feb 2008 14:07:23 -0800, Amit Gupta wrote: > Class A(object) : > self.x = 1 This is not valid Python code. > I want something like: > for userattrib in A.getAllUserAttribute() : > print userattrib > > My question is, is there a builtin function, called > getAllUserAttributes? No and there can't be since the attributes you seem to be interested in don't exist until an instance is created. Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
getting all user defined attributes of a class
Hi How do I get user defined attributes of a class? e.g Class A(object) : self.x = 1 -- I want something like: for userattrib in A.getAllUserAttribute() : print userattrib My question is, is there a builtin function, called getAllUserAttributes? Thanks -- http://mail.python.org/mailman/listinfo/python-list
