fix(py): fix living log and test flows in sample-flow-test tool

[MengqinShen]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @MengqinShen, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the testing infrastructure for Python samples by improving the visibility of test execution and making the logging process more robust. The changes enable real-time feedback during flow runs and provide better debugging information in case of failures, while also preventing potential issues with external service rate limits during sequential testing.

Highlights

• Live Logging: Implemented live logging for flow testing progress and results, providing immediate feedback during execution.
• Subprocess Output Streaming: Refactored subprocess execution from subprocess.run to subprocess.Popen to stream output, improving visibility during long-running tests.
• Enhanced Error Handling: Improved error handling for parsing subprocess JSON output, now including raw output for better debugging in case of failures.
• Visible Flow Logs: Removed stdout redirection in run_single_flow.py to ensure internal flow logs are visible during execution.
• Rate Limit Mitigation: Added a 10-second delay between sample flow executions to mitigate potential rate limiting issues with external services.

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Changelog

• py/samples/sample-test/review_sample_flows.py
  • Added print statements for live logging during flow testing.
  • Changed subprocess execution from run to Popen to enable output streaming.
  • Improved error handling for JSON parsing, including printing raw output on failure.
  • Introduced a 10-second delay between flow tests.
• py/samples/sample-test/run_single_flow.py
  • Removed stdout redirection to allow flow logs to be visible.
  • Added a try-except block for asyncio.run to catch exceptions.
  • Ensured the final JSON result is printed with explicit start and end markers.

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[gemini-code-assist]

Code Review

The pull request introduces significant improvements to the flow testing and logging mechanisms. By switching to subprocess.Popen and streaming output, the review process now provides live feedback during flow execution, which is a great enhancement for user experience and debugging. The run_single_flow.py script has been updated to support this streaming and robustly handle errors during asynchronous flow execution. There are a couple of minor issues related to exception handling and import placement that could be improved for better code quality.

[gemini-code-assist]

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