René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Invalid python generated when using nested dictionaries","articleBody":"**Describe the bug**\r\nUsing `openapi-python-client` on a valid FastAPI/pydantic API is generating invalid client library on 0.7.2 when there is a somewhat complex set of nested `Dict` and `Union` types.\r\n\r\n**To Reproduce**\r\nPut the following in a main.py\r\n```\r\nfrom typing import Any, Dict, List, Union\r\nfrom fastapi import FastAPI\r\nfrom pydantic import (\r\n    BaseModel,\r\n    StrictBool,\r\n    StrictInt,\r\n    StrictFloat,\r\n    StrictStr,\r\n)\r\n\r\napp = FastAPI()\r\n\r\nJSONValue = Union[\r\n    Dict[str, Any], List[Any], StrictBool, StrictFloat, StrictInt, StrictStr, None\r\n]\r\nJSONDict = Dict[str, JSONValue]\r\n\r\nclass ItemMapResource(BaseModel):\r\n    items: JSONDict\r\n\r\n@app.get(\"/\", response_model=ItemMapResource)\r\ndef read_item():\r\n    return ItemMapResource(items={})\r\n```\r\n\r\nRun it like this:\r\n```\r\n uvicorn main:app --reload --port 4000\r\n```\r\n\r\nGenerate a client library like this\r\n```\r\nopenapi-python-client generate --url  http://localhost:4000/openapi.json\r\n```\r\n\r\n**Expected behavior**\r\nShould generate valid python library\r\n\r\n**Actual behavior**\r\nGenerates code with broken indents which fails to execute:\r\n```\r\n@attr.s(auto_attribs=True)\r\nclass ItemMapResourceItems:\r\n    \"\"\"  \"\"\"\r\n    additional_properties: Dict[str, Union[ItemMapResourceItemsAdditionalProperty, List[None], bool, float, int, str]] = attr.ib(init=False, factory=dict)\r\n\r\n\r\n    def to_dict(self) -\u003e Dict[str, Any]:\r\n\r\n        field_dict: Dict[str, Any] = {}\r\n        for prop_name, prop in self.additional_properties.items():\r\n            if isinstance(prop, ItemMapResourceItemsAdditionalProperty):\r\n        field_dict[prop_name] = prop.to_dict()\r\n\r\n    elif isinstance(prop, List[None]):\r\n        field_dict[prop_name] = []\r\n        for additional_property_item_data in prop:\r\n            additional_property_item =  None\r\n\r\n            field_dict[prop_name].append(additional_property_item)\r\n\r\n\r\n\r\n\r\n    elif isinstance(prop, bool):\r\n        field_dict[prop_name] = prop\r\n    elif isinstance(prop, float):\r\n        field_dict[prop_name] = prop\r\n    elif isinstance(prop, int):\r\n        field_dict[prop_name] = prop\r\n    else:\r\n        field_dict[prop_name] = prop\r\n\r\n        field_dict.update({\r\n        })\r\n\r\n        return field_dict\r\n\r\n```\r\nNote the line `if isinstance(prop, ItemMapResourceItemsAdditionalProperty):` is indented incorrectly.\r\n\r\n\r\n\r\n**OpenAPI Spec File**\r\n```\r\n{\"openapi\":\"3.0.2\",\"info\":{\"title\":\"FastAPI\",\"version\":\"0.1.0\"},\"paths\":{\"/\":{\"get\":{\"summary\":\"Read Item\",\"operationId\":\"read_item__get\",\"responses\":{\"200\":{\"description\":\"Successful Response\",\"content\":{\"application/json\":{\"schema\":{\"$ref\":\"#/components/schemas/ItemMapResource\"}}}}}}}},\"components\":{\"schemas\":{\"ItemMapResource\":{\"title\":\"ItemMapResource\",\"required\":[\"items\"],\"type\":\"object\",\"properties\":{\"items\":{\"title\":\"Items\",\"type\":\"object\",\"additionalProperties\":{\"anyOf\":[{\"type\":\"object\"},{\"type\":\"array\",\"items\":{}},{\"type\":\"boolean\"},{\"type\":\"number\"},{\"type\":\"integer\"},{\"type\":\"string\"}]}}}}}}}\r\n```\r\n\r\n**Desktop (please complete the following information):**\r\n - OS: Ubuntu 20.04\r\n - Python Version: 3.8.3\r\n - openapi-python-client version 0.7.2\r\n\r\n**Additional context**\r\nThis worked fine with 0.7.0, so I suspect a regression from #252 ","author":{"url":"https://github.com/joshzana","@type":"Person","name":"joshzana"},"datePublished":"2020-12-15T01:06:45.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/266/openapi-python-client/issues/266"}