On 03/17/2015 12:52 PM, Luciano Ramalho wrote:
Sometimes we need a simple class to hold some mutable attributes, provide a nice repr, support == for testing, and support iterable unpacking, so you can write:
p = Point(3, 4) x, y = p
That's very much like the classes built by namedtuple, but mutable.
https://pypi.python.org/pypi/namedlist
It also adds default values to the generated constructor, which may or may not be desirable. But if used exactly like collections.namedtuple, it ignores the default values.
Eric.
I propose we add to the collections module another class factory. I am calling it plainclass, but perhaps we can think of a better name. Here is how it would be used:
import collections Point = collections.plainclass('Point', 'x y')
The signature of the plainclass function would be exactly the same as namedtuple, supporting the same alternative ways of naming the attributes.
The semantics of the generated Point class would be like this code:
https://gist.github.com/ramalho/fd3d367e9d3b2a659faf
What do you think?
Cheers,
Luciano
PS. I am aware that there are "Namespace" classes in the standard library (e.g. [2]). They solve a different problem.
[2] https://docs.python.org/3/library/argparse.html#argparse.Namespace