Default None for uuid property raises AttributeError (name collision)

[hofrob]

Initial Checks

• I confirm that I'm using Pydantic V2

Description

Declaring a pydantic model with a property named uuid and type uuid.UUID | None and a default value of None raises AttributeError: 'NoneType' object has no attribute 'UUID'.

This is probably true for other import/property name collisions as well.

Work arounds:

• rename the property
• remove the default value
• change the import to from uuid import UUID

Example Code

import uuid

import pydantic


class Foo(pydantic.BaseModel):
    uuid: uuid.UUID | None = None

Python, Pydantic & OS Version

pydantic version: 2.0.2
        pydantic-core version: 2.1.2 release build profile
                 install path: /project/path/venv/lib/python3.11/site-packages/pydantic
               python version: 3.11.4 (main, Jul 11 2023, 22:38:37) [GCC 11.3.0]
                     platform: Linux-5.19.0-46-generic-x86_64-with-glibc2.35
     optional deps. installed: ['typing-extensions']

Selected Assignee: @adriangb

[Viicos]

This isn't related to Pydantic, it has to do with how Python finds references to the type hints you are using. Foo has its own class scope, and when you are using the type hint uuid.UUID, it tries to resolve uuid in this class scope, which is set to None with the default value.

Either use from uuid import UUID or uuid: "uuid.UUID | None" = None

[samuelcolvin]

This isn't related to Pydantic, it has to do with how Python finds references to the type hints you are using. Foo has its own class scope, and when you are using the type hint uuid.UUID, it tries to resolve uuid in this class scope, which is set to None with the default value.

Either use from uuid import UUID or uuid: "uuid.UUID | None" = None

Exactly 👍 .