[bug][python][model] Should not import self

[wy-z]

Description

Swagger-codegen version

2.3.1

Swagger declaration file content or url

"PlacementNode": {
    "type": "object",
    "title": "PlacementNode",
    "properties": {
        "create": {
            "type": "string",
            "format": "date-time"
        },
        "id": {
            "type": "integer",
            "format": "int64"
        },
        "name": {
            "type": "string"
        },
        "parent": {
            "$ref": "#/definitions/PlacementNode"
        },
        "type": {
            "type": "string"
        },
        "update": {
            "type": "string",
            "format": "date-time"
        }
    }
}

Command line used for generation

generate -l python

[gorlins]

ran into this too... did not occur in v2.2.3

[jimmyjames]

Seeing this as well on 2.3.0. Maybe related to #6839? (looking at the generated # noqa: F401,E501 comments introduced there).

[jacobweber]

Same issue....had to manually remove one of the circular references before building.

[wy-z]

@jacobweber Try #7542, It works for me~

[tomplus]

In my opinion we should remove these imports from models. It makes a lot of problems with circular dependencies between 2 or more models (model A has an attribute with model B and model B has a optional attribute with model A). These imported objects are not used at all and we know about it - we added F401 to disable warning from pylint :/

[macks22]

Didn't have time to make any contributions to the referenced PR, but I made a gist that can be used to comment out the problematic lines after the code is generated. Hopefully this can be useful for those still dealing with this problem.

https://gist.github.com/macks22/a087cce914090b4a5d3a16e8ab3c28aa

[erraggy]

In my opinion we should remove these imports from models. It makes a lot of problems with circular dependencies between 2 or more models (model A has an attribute with model B and model B has a optional attribute with model A).

YES

Please remove the imports for parent/child referenced types as they do in fact cause runtime errors from circular imports!

[Sarek-Wyona]

We currently have data models that use other data types as part of their definition. We are seeing circular imports in this case.

If datatype A uses data type B as a part of one variable type. The import for datatype B is present in the datatype A file (not needed as the type is used only as string or doc string). But then datatype B imports datatype A (causing circular import - again not needed)

I have to manually comment out one of these import statements before my auto-generated client works without an import error!

Is this currently being worked on?