[BUG][PYTHON] Single quotes not escaped

Created by: fsonntag

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix

Description

Single quotes are not escaped and break the code. From the given example, the inline_object.py contains this line: def __init__(self, highlight='A text containing 'single' quotes'): # noqa: E501.

Expected: def __init__(self, highlight='A text containing \'single\' quotes'): # noqa: E501 or: def __init__(self, highlight="A text containing 'single' quotes"): # noqa: E501

openapi-generator version

v4.0.0-beta3

OpenAPI declaration file content or url

{
    "openapi": "3.0.0",
    "info": {
        "title": "Single quote example",
        "version": "1.0.0"
    },
    "paths": {
        "/example": {
            "post": {
                "requestBody": {
                    "content": {
                        "application/json": {
                            "schema": {
                                "type": "object",
                                "properties": {
                                    "highlight": {
                                        "type": "string",
                                        "example": "A text containing 'single' quotes"
                                    }
                                }
                            }
                        }
                    }
                },
                "responses": {
                    "200": {
                        "description": "OK"
                    }
                }
            }
        }
    }
}

-->

Command line used for generation

java -jar openapi-generator-cli-4.0.0-beta3.jar generate -i example.json -g python -o example-client

Steps to reproduce

Run the given command with the given example.

Related issues/PRs

Nothing found

Suggest a fix

Escape single quotes or use double quotes. I'm not familiar with the source code of the generator, so I can't fix it. If given a hint where put the fix, I'd be happy to open a PR.