[BUG] [Python] arrays validation problems for maxItems/minItems

[SapMaria]

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 (example)

Description

Validation rules are not added for lists (maxItems/minItems values) to the generated Python SDK (I tested only for Python).

I also tried to add validation rules for string, number and integer. It's ok.

openapi-generator version

4.3.1 (additionaly checked on latest 5.0.0-beta)

OpenAPI declaration file content or url

requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                os:
                  type: object
                  required:
                    - name
                    - version
                  properties:
                    name:
                      type: string
                    version:
                      type: string
                packages:
                  type: array
                  minItems: 1
                  maxItems: 5
                  items:
                    type: string

Generation Details

java -jar openapi-generator-cli-4.3.1.jar generate  -i v1.yaml -g python -o ~/projects/sdk-openapi

Steps to reproduce

Just use generator script with default options for python.

Related issues/PRs

Not found.

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[spacether]

This ticket is stale and should be fixed in master.
maxItems and minItems validations are checked here:
https://github.com/OpenAPITools/openapi-generator/blob/master/samples/openapi3/client/petstore/python/petstore_api/model_utils.py#L777-L797