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To: python-list@python.org
From: Peter Otten <__peter__@web.de>
Subject: Re: Passing new fields to an object
Date: Fri, 12 Jun 2015 18:17:09 +0200
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Xref: csiph.com comp.lang.python:92537

Paulo da Silva wrote:

> I would like to do something like this:
> 
> class C:
> def __init__(self,**parms):
> ...
> 
> c=C(f1=1,f2=None)
> 
> I want to have, for the object
> self.f1=1
> self.f2=None
> 
> for an arbitrary number of parameters.
> 
> What is the best way to achieve this?

Use a dict ;)

While I'd recommend that you spell out the possible arguments here is one 
way to not obey my advice:

>>> import types
>>> class C(types.SimpleNamespace):
...     pass
... 
>>> c = C(f1=1, f2=None)
>>> c
C(f1=1, f2=None)

If you want to do it manually you can either use

for name, value in parms.items():
    setattr(self, name, value)

or the less general

self.__dict__.update(parms)

Again, if you don't know the names in advance the appropriate data structure 
is a dict.