Re: DictProxy? What is this?
[EMAIL PROTECTED] wrote: When I tried to update a class's __dict__, I got an error saying that there is no 'update' attribute for dictproxy object. What is a dictproxy object? a CPython implementation detail, used to protect an internal data structure used by new-style objects from unexpected modifications. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: DictProxy? What is this?
Fredrik Lundh wrote: [EMAIL PROTECTED] wrote: When I tried to update a class's __dict__, I got an error saying that there is no 'update' attribute for dictproxy object. What is a dictproxy object? a CPython implementation detail, used to protect an internal data structure used by new-style objects from unexpected modifications. /F Ah, so I'm not suppose to be able to change a class's __dict__? Thanks Fredrik. -- http://mail.python.org/mailman/listinfo/python-list
Re: DictProxy? What is this?
Le lundi 26 juin 2006 16:06, [EMAIL PROTECTED] a écrit :
Fredrik Lundh wrote:
[EMAIL PROTECTED] wrote:
When I tried to update a class's __dict__, I got an error saying that
there is no 'update' attribute for dictproxy object. What is a
dictproxy object?
a CPython implementation detail, used to protect an internal data
structure used by new-style objects from unexpected modifications.
/F
Ah, so I'm not suppose to be able to change a class's __dict__? Thanks
Fredrik.
Of course, yes :
In [1]: class a(object) : pass
...:
In [2]: a.__dict__
Out[2]: dictproxy object at 0xa7e01d34
In [3]: a.__dict__.items()
Out[3]:
[('__dict__', attribute '__dict__' of 'a' objects),
('__module__', '__main__'),
('__weakref__', attribute '__weakref__' of 'a' objects),
('__doc__', None)]
In [4]: a.__dict__['foo'] = lambda s : True
---
exceptions.TypeError...
TypeError: object does not support item assignment
hmmm, not this way, but :
In [5]: a.foo = lambda s : True
In [6]: a.__dict__.items()
Out[6]:
[('__dict__', attribute '__dict__' of 'a' objects),
('__module__', '__main__'),
('foo', function lambda at 0xa79528ec),
('__weakref__', attribute '__weakref__' of 'a' objects),
('__doc__', None)]
In [7]: a().foo()
Out[7]: True
or :
In [9]: setattr(a, 'bar', lambda s : False)
In [10]: a().bar()
Out[10]: False
--
_
Maric Michaud
_
Aristote - www.aristote.info
3 place des tapis
69004 Lyon
Tel: +33 426 880 097
--
http://mail.python.org/mailman/listinfo/python-list
Re: DictProxy? What is this?
All right. Thanks for explaining that Maric.
Maric Michaud wrote:
Le lundi 26 juin 2006 16:06, [EMAIL PROTECTED] a écrit :
Fredrik Lundh wrote:
[EMAIL PROTECTED] wrote:
When I tried to update a class's __dict__, I got an error saying that
there is no 'update' attribute for dictproxy object. What is a
dictproxy object?
a CPython implementation detail, used to protect an internal data
structure used by new-style objects from unexpected modifications.
/F
Ah, so I'm not suppose to be able to change a class's __dict__? Thanks
Fredrik.
Of course, yes :
In [1]: class a(object) : pass
...:
In [2]: a.__dict__
Out[2]: dictproxy object at 0xa7e01d34
In [3]: a.__dict__.items()
Out[3]:
[('__dict__', attribute '__dict__' of 'a' objects),
('__module__', '__main__'),
('__weakref__', attribute '__weakref__' of 'a' objects),
('__doc__', None)]
In [4]: a.__dict__['foo'] = lambda s : True
---
exceptions.TypeError...
TypeError: object does not support item assignment
hmmm, not this way, but :
In [5]: a.foo = lambda s : True
In [6]: a.__dict__.items()
Out[6]:
[('__dict__', attribute '__dict__' of 'a' objects),
('__module__', '__main__'),
('foo', function lambda at 0xa79528ec),
('__weakref__', attribute '__weakref__' of 'a' objects),
('__doc__', None)]
In [7]: a().foo()
Out[7]: True
or :
In [9]: setattr(a, 'bar', lambda s : False)
In [10]: a().bar()
Out[10]: False
--
_
Maric Michaud
_
Aristote - www.aristote.info
3 place des tapis
69004 Lyon
Tel: +33 426 880 097
--
http://mail.python.org/mailman/listinfo/python-list
