fix: importlib-metadata as a dependency on Python>=3.10

[hr1shu]

Issue Summary

The zulip_bots package attempts to import importlib_metadata regardless of the Python version, even though importlib-metadata is not listed as a dependency in the package. This leads to an ImportError on Python versions >= 3.10, where importlib.metadata is included in the standard library, but the fallback to importlib_metadata is still attempted.

Root Cause

The error occurs because the code in zulip_bots does not correctly handle the conditional import for importlib-metadata vs. the standard library's importlib.metadata. The setup.py configuration ensures the dependency is installed only for Python < 3.10, but the runtime code doesn't account for the difference in module naming.

Solution

To fix the issue, I modified the code in zulip_bots/finder.py to conditionally import the appropriate module based on the Python version.

Testing

Verified behavior on Python 3.9 and Python 3.10+ environments:
Python >= 3.10: Uses importlib.metadata.
Python < 3.10: Falls back to importlib_metadata.
Added unit tests to validate both paths with mock objects.

Impact

This fix ensures that:

The package correctly resolves metadata imports regardless of Python version.
Dependencies are installed appropriately based on the Python version.

[hr1shu]

Hi @timabbott, although the fix is done and it's working fine locally, can anyone help me understand why checks are failing?

[timabbott]

Can you clean up your PR? Check out our GitHub guide and commit guidelines for more details, as well as the contributing guide.

Test failures seem related to your changes, try testing locally with those Python versions.