[Bug]: [Python] Emitted code failed linting

[msftsettiy]

Describe the bug

Emitted code in the confidentialledger SDK failed linting due to the use of type() over isinstance()

Reproduction

The file that failed the linting is https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/confidentialledger/azure-confidentialledger-certificate/azure/confidentialledger/certificate/_utils/model_base.py. Line numbers 820, 823 and 829 failed linting.

Link to the failed build https://dev.azure.com/azure-sdk/public/_build/results?buildId=6714589&view=results

Checklist

• Follow our Code of Conduct
• Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion.
• The provided reproduction is a minimal reproducible example of the bug.

[github-actions]

🎯 Issue Triage

The Python client emitter is generating code that uses type() instead of isinstance(), causing linting failures in the emitted SDK code (specifically model_base.py in the confidentialledger SDK).

Category: Bug
Area: emitter:client:python

⚠️ No reproduction TypeSpec code provided. A link to the affected generated file and failed build was provided instead.

🔍 Analysis

• Affected file: model_base.py in azure-confidentialledger-certificate — lines 820, 823, 829
• Root cause: The Python emitter generates type(x) == SomeType style checks instead of isinstance(x, SomeType), which violates Python linting rules (typically isinstance is preferred per PEP 8 and common linters like pylint/flake8)
• Impact: SDK CI pipelines fail due to linting errors in generated code
• Failed build: [Azure SDK public build #6714589]((dev.azure.com/redacted)

📝 Suggested next steps

• Identify which template/emitter file generates the type() comparison in model_base.py
• Replace type(x) == SomeType with isinstance(x, SomeType) in the emitter template
• Verify fix by regenerating the SDK and checking linting passes

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