CODEWITHSUNDEEP
pythontypes
Thomas
Thomas

Reputation: 5104

Join / merge two Python SimpleNamespace

Simple question: How do I merge Python's SimpleNamespace?

It looks like there is no way to do this in a simple command like a.update(b) or a | b. In fact, I haven't even found a way to systematically access all attributes of a SimpleNamespace.

Any leads?

Upvotes: 4

Views: 1495

Answers (1)

MisterMiyagi
MisterMiyagi

Reputation: 51989

Each SimpleNamespace has a __dict__ slot, which gives access to its actual attributes. **-unpacking the __dict__ from multiple SimpleNamespaces into a new SimpleNamespace effectively merges them.

>>> from types import SimpleNamespace
>>> first = SimpleNamespace(a=0, b=1, c=2)
>>> second = SimpleNamespace(x=0, y=1, z=2)
>>> SimpleNamespace(**first.__dict__, **second.__dict__)
namespace(a=0, b=1, c=2, x=0, y=1, z=2)

Note that it is a TypeError to merge namespaces with overlapping attributes this way.

To merge namespaces with possibly overlapping keys, use an intermediate dictionary and unpack it again (**{...}). The values of later namespaces take precedence with this scheme.

>>> first = SimpleNamespace(a=0, b=1, c=2)
>>> second = SimpleNamespace(c=0, d=1, e=2)
>>> SimpleNamespace(**{**first.__dict__, **second.__dict__})
namespace(a=0, b=1, c=0, d=1, e=2)

Upvotes: 8

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