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[python] fix: 8579

Open Administrator requested to merge github/fork/mfmarche/fix_9684 into master

Created by: mfmarche

Updates the python generator to fix a recursion issue when checking discriminators Issue 8579 is where recursive models would cause an endless loop. Resolve this by keeping tracking of discriminator models that have been seen.

Also updated petstore openapi with a new property that would previously fail without this change.

fixes:

PR checklist

  • Read the contribution guidelines.
  • Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
  • Run the following to build the project and update samples: 
    ./mvnw clean package 
./bin/generate-samples.sh
./bin/utils/export_docs_generators.sh
    Commit all changed files. This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master. These must match the expectations made by your contribution. You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*. For Windows users, please run the script in Git BASH.
  • File the PR against the correct branch: master, 5.1.x, 6.0.x
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