CODEWITHSUNDEEP
pythonpython-3.xinheritance
Simon
Simon

Reputation: 762

Python get class but exclude inherited attributes and methods

Hi I have 2 classes a Model and Parent Class

ModelMaster:
  myvar: string = "one"
  def myfun():
    # do stuff

Model(ModelMaster):
  first: string = "hello"
  second: int = 123

Modelmaster contains functions that all models should use and attributes

When using the Model as purely a model I want to get the Model instance including all of its attributes but I dont want to see anything that was inherited from ModelMaster

Is there someway to get, from instance of Model, a copy of that model with just the attributes of that class that has all parent attributes and methods removed.

It seems like there would be something built into python3 to do this, rather than writing this myself

anyone have any ideas?

thanks, Simon

Upvotes: 1

Views: 2108

Answers (2)

Simon
Simon

Reputation: 762

The best solution I found was to use

annotations = self.__annotations__
keys = {}
for annotation in annotations:
    name = annotation
    type = annotations[annotation]
    data = self.__getattribute__(annotation)
keys.append({"name":name, "type":type, "data":data})

this method can exist in any class in the inheritance tree and it will only return the attributes for the top level class

I'm still hoping that someone might come up with a cleaner version but this works for me

Upvotes: 0

blhsing
blhsing

Reputation: 106553

You can create a new class with Model.__dict__ passed to the type constructor, but not Model's base class:

PureModel = type('PureModel', (), dict(Model.__dict__))

so that:

print(PureModel().first)

outputs:

hello

and that PureModel().myvar would result in:

AttributeError: 'PureModel' object has no attribute 'myvar'

Upvotes: 3

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