Python refactor and simplification

[glenn-jocher]

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🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Updated code for improved efficiency and readability.

📊 Key Changes

• Simplified code in export.py by directly passing file path without casting to string.
• Changed list comprehension style in common.py for better readability.
• Compact conditional logic in downloads.py.
• Small indentation fix in ClearML README.md.
• Optimized condition checks and used concise dictionary initialization in clearml_utils.py and other logger util files.
• Refactored multiple if conditions into a single, cleaner condition in Comet logger utils for streamlined logic.

🎯 Purpose & Impact

• The changes aim to make the codebase more maintainable and easier to understand.
• For end-users, these modifications result in cleaner logs and potential minor performance improvements.
• Developers will benefit from the increased clarity when maintaining or extending the code.