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From: Anders Munch <ajm@flonidan.dk>
Newsgroups: comp.lang.python
Subject: Re: Configuring an object via a dictionary
Date: Mon, 18 Mar 2024 13:57:57 +0000
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Bytes: 9780

dn wrote:
>Loris Bennett wrote:
>> However, with a view to asking forgiveness rather than
>> permission, is there some simple way just to assign the dictionary
>> elements which do in fact exist to self-variables?
>
>Assuming config is a dict:
>
>	self.__dict__.update( config )

Here's another approach:

config_defaults =3D dict(
     server_host=3D'localhost',
     server_port=3D443,
    # etc.
)
....
        def __init__(self, config):
            self.conf =3D types.SimpleNamespace(**{**config_defaults, **con=
fig})

This gives you defaults, simple attribute access, and avoids the risk of na=
me collisions that you get when updating __dict__.

Using a dataclass may be better:

@dataclasses.dataclass
class Settings:
     group_base : str
     server_host : str =3D 'localhost'
     server_port : int =3D 443
....
        def __init__(self, config):
            self.conf =3D Settings(**config)

regards, Anders