Fix a compatible issue with very old version of Python

[aisk]

Summary by CodeRabbit

• Refactor
  • Improved compatibility with various Python versions by conditionally importing importlib.abc in the Thrift module handling.

[coderabbitai]

Walkthrough

The update introduces a conditional import of importlib.abc in the thriftpy2 package, specifically within the hook.py file. This change is designed to ensure compatibility across different Python versions, targeting Python 3.4 and newer. By adapting the import behavior based on the Python version, the modification enhances the module's flexibility and usability across various environments.

Changes

File	Summary of Changes
thriftpy2/hook.py	Conditionally imports importlib.abc for Python versions 3.4 and above, affecting ThriftImporter.

🐇✨
In the realm of code, where the rabbits hop,
A change was made, not a lot, just a drop.
importlib.abc, now comes when it's time,
For Python 3.4 and above, it's prime.
So hop along, code, with ease and grace,
With every version, you'll find your place.
🌟🐾

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Review Status

Actionable comments generated: 2

Configuration used: CodeRabbit UI

Commits

Files that changed from the base of the PR and between 1f6cad4 and 82f03af.

Files selected for processing (1)

• thriftpy2/hook.py (2 hunks)

Additional comments: 4

thriftpy2/hook.py (4)

• 17-18: Conditional import of importlib.abc is correctly implemented for Python versions 3.4 and above. This approach ensures compatibility across different Python versions by leveraging features available in newer versions while providing fallbacks for older versions.
• 14-21: > 📝 NOTE

This review was outside the diff hunks and was mapped to the diff hunk with the greatest overlap. Original lines [17-32]

The ThriftImporter class for Python 3.4+ uses importlib.abc.MetaPathFinder, which is the correct approach for custom importers in newer Python versions. However, it's important to ensure that the find_spec method correctly handles the case when the module name does not end with the specified extension, returning None as expected.

• 3-8: > 📝 NOTE

This review was outside the diff hunks, and no overlapping diff hunk was found. Original lines [42-57]

For versions below Python 3.4, the ThriftImporter class provides backward compatibility by defining find_module and load_module methods. This approach ensures that the library can still be used in older Python environments. However, it's crucial to test this fallback mechanism thoroughly to ensure that it behaves as expected across all supported Python versions.

• 3-8: > 📝 NOTE

This review was outside the diff hunks, and no overlapping diff hunk was found. Original lines [59-66]

The install_import_hook and remove_import_hook functions correctly manipulate sys.meta_path to install and remove the custom importer. This approach is standard for implementing meta path importers in Python. However, it's important to ensure that these functions are called appropriately to avoid unintended side effects, such as removing other important meta path finders.

[aisk]

Since this is an emergency fix, I'd merge this immediately and publish a new version without any review.