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pythonlistsetattrpython-builtins
HappyFace
HappyFace

Reputation: 4133

How to add custom attributes to a Python list?

I'm trying to associate additional data with a Python list. Ideally, I'd like to add custom attributes to a list object, similar to how you'd add attributes to a custom class. For example:

a = [1, 2, 4, 8]
a.x = "Hey!"  # I'd like this to work without errors

However, when I attempt this, I get the following error:

AttributeError: 'list' object has no attribute 'x'

I understand that Python lists don't support adding arbitrary attributes out of the box. I also tried using setattr, but it gave me a similar error:

setattr(a, "k", 98)  # Raises AttributeError

I cannot create a custom class DummyList(list) to work around this (for reasons). I also don't want to use some global variable that holds the attributes for the lists. Are there any workarounds to achieve this in Python?

Upvotes: 0

Views: 135

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