How to initialize a SimpleNamespace from a dict [duplicate]

Question

I'm sure this must be simple, but I could not find the answer.

I have a dictionary like:

d = {'a': 1, 'b':2}

I'd like to access that via dot notation, like: d.a

The SimpleNamespace is designed for this, but I cannot just pass the dict into the SimpleNamespace constructor. I get the error: TypeError: no positional arguments expected

How do I initialize the SimpleNamespace from a dictionary?

Answer 1

Pass in the dictionary using the **kwargs call syntax to unpack your dictionary into separate arguments:

SimpleNamespace(**d)

This applies each key-value pair in d as a separate keyword argument.

Conversely, the closely releated **kwargs parameter definition in the __init__ method of the class definition shown in the Python documentation captures all keyword arguments passed to the class into a single dictionary again.

Demo:

>>> from types import SimpleNamespace
>>> d = {'a': 1, 'b':2}
>>> sn = SimpleNamespace(**d)
>>> sn
namespace(a=1, b=2)
>>> sn.a
1