On Sun, May 27, 2012 at 1:58 PM, T.B. <bauertomer@gmail.com> wrote:
On 2012-05-27 19:08, Sven Marnach wrote:
Calvin Spealman schrieb am Sun, 27. May 2012, um 09:42:26 -0400:
- record - flexobject - attrobject - attrdict - nameddict - namedobject
Since the proposed type is basically an `object` allowing attributes, another option would be `attrobject`.
Adding an `__iter__()` method, as proposed earlier in this thread, seems unnecessary; you can simply iterate over `vars(x)` for an `attrobject` instance `x`.
Is this whole class really necessary? As said before, this type is implemented numerous times: * empty class (included in the Python Tutorial) [1] * argparse.Namespace [2] * multiprocessing.managers.Namespace [3] * bunch (PyPI) that inherits from dict, instead of wrapping __dict__ [4] * many more...
All of the re-implementations of essentially the same thing is exactly why a standard version is constantly suggested. That said, it is so simple that it easily has many variants, because it is only the base of the different ideas all these things implement.
Each of them has a different semantics. Each is suited for a slightly different use case and they are so easy to implement. So you can customize to your liking - fields can or can't begin with "_", the later __repr__ comment or the color of the shed. Still, it seems they do not have a "killer feature" like namedtuple's efficiency.
Noticeable is how much they resemble a dict. Some let you iterate over the keys, test for equality and even all of the builtin dict methods (bunch). If you already use vars() for iteration, you might want a dict.
Funny that except for the easy "class Namespace: pass", the rest fail repr for recursive/self-referential objects:
from argparse/multiprocessing.managers/simplenamespace import Namespace ns = Namespace() ns.a = ns repr(ns) ... RuntimeError: maximum recursion depth exceeded
The next snippet use the fact that dict's __repr__ knows how to handle recursion to solve the RuntimeError problem: def __repr__(self): return "{}({!r})".format(self.__class__.__name__, self.__dict__)
TB
[1] http://docs.python.org/dev/tutorial/classes.html#odds-and-ends [2] http://hg.python.org/cpython/file/c1eab1ef9c0b/Lib/argparse.py#l1177 [3] http://hg.python.org/cpython/file/c1eab1ef9c0b/Lib/multiprocessing/managers.... [4] http://pypi.python.org/pypi/bunch
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