[BUG][Python] Schema property named _ (a single underscore) generates broken syntax

Description

Syntax error in generated Python code as the processing eats the underscore and leaves us with nothing:

class TestGet200Response(BaseModel):
    """
    TestGet200Response
    """ # noqa: E501
    : Optional[StrictStr] = Field(default=None, alias="_")
    __properties: ClassVar[List[str]] = ["_"]

    model_config = ConfigDict(

openapi-generator version

git 9351217048ff3564dff

OpenAPI declaration file content or url

openapi: '3.0.0'
info:
  version: 1.0.0
  title: test
paths:
  /test:
    get:
      summary: sample
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: object
                properties:
                  _:
                    type: string

Generation Details

java -jar openapi-generator-cli-7.5.0-SNAPSHOT.jar generate -i undersc.yml -o undersc/ -g python

Steps to reproduce

Use the python generator on a spec with _ as the field name in a response.

Related issues/PRs

couldn't find any 🤷‍♀️

Suggest a fix

Don't eat the underscore? Or rename the field, seems like angular has turned it into _u 🤔

Reproduce the issue with the provided undersc.yml and the Python generator command, then inspect the generator path that produces the shown response model. Done means the generated Python is syntactically valid while retaining the schema property alias "_"; verify the result by compiling or otherwise parsing the generated model.