[NoahStapp]

PYTHON-6275

Changes in this PR

Enable all ruff PERF rules and make the code changes required to pass them. All of these required changes are replacing loops with list/dict comprehensions.

Test Plan

Existing test suite.

Checklist

Checklist for Author

• [ ] Did you update the changelog (if necessary)?
• [ ] Is there test coverage?
• [ ] Is any followup work tracked in a JIRA ticket? If so, add link(s).

Checklist for Reviewer

• Does the title of the PR reference a JIRA Ticket?
• Do you fully understand the implementation? (Would you be comfortable explaining how this code works to someone else?)
• Is all relevant documentation (README or docstring) updated?

[Copilot]

🟡 Changes recommended

Bounded to_list(length) calls create an unnecessary temporary list, adding auxiliary memory proportional to the number of documents transferred.

1 open issue

• Avoid temporary list allocation in bounded to_list calls · New

What changed in this PR

This PR enables Ruff’s PERF rules across PyMongo and updates collection-building patterns in the driver, tests, and tooling to comply.

Changes:

• Enable the PERF rule family in Ruff configuration.
• Replace append and assignment loops with comprehensions, extend, and update.
• Apply corresponding changes to asynchronous code and generated synchronous counterparts.

File	Description
tools/​generate_sbom_requirements.py	Collect requirement files with a comprehension.
test/​unified_format.py	Simplify command-event filtering.
test/​test_discovery_and_monitoring.py	Simplify concurrent runner creation.
test/​test_custom_types.py	Build decimal test documents with a comprehension.
test/​test_client_bulk_write.py	Simplify write-model creation and event filtering.
test/​test_change_stream.py	Generate collection names with a comprehension.
test/​test_bulk.py	Extend bulk documents from a generator.
test/​test_auth.py	Simplify authentication thread creation.
test/​test_auth_oidc.py	Simplify concurrent runner creation.
test/​asynchronous/​unified_format.py	Simplify command-event filtering.
test/​asynchronous/​test_discovery_and_monitoring.py	Simplify concurrent runner creation.
test/​asynchronous/​test_custom_types.py	Build decimal test documents with a comprehension.
test/​asynchronous/​test_concurrency.py	Build task coroutines with a comprehension.
test/​asynchronous/​test_client_bulk_write.py	Simplify write-model creation and event filtering.
test/​asynchronous/​test_change_stream.py	Generate collection names with a comprehension.
test/​asynchronous/​test_bulk.py	Extend bulk documents from a generator.
test/​asynchronous/​test_auth.py	Simplify authentication thread creation.
test/​asynchronous/​test_auth_oidc.py	Simplify concurrent runner creation.
pyproject.toml	Enable Ruff’s PERF rules.
pymongo/​uri_parser_shared.py	Merge remaining options with dict.update.
pymongo/​synchronous/​cursor.py	Extend bounded batches using a comprehension.
pymongo/​synchronous/​command_cursor.py	Extend bounded command batches using a comprehension.
pymongo/​encryption_options.py	Build option documents with dictionary comprehensions.
pymongo/​common.py	Extend version padding from a generator.
pymongo/​client_options.py	Simplify TLS option collection.
pymongo/​asynchronous/​cursor.py	Extend bounded batches using a comprehension.
pymongo/​asynchronous/​command_cursor.py	Extend bounded command batches using a comprehension.
gridfs/​synchronous/​grid_file.py	Build bounded cursor results with a comprehension.
gridfs/​asynchronous/​grid_file.py	Build bounded cursor results with an awaited comprehension.
bson/​son.py	Build representation fragments with a comprehension.
.evergreen/​scripts/​generate_config.py	Extend CI tasks from a generator.

_{Review effort: Balanced}

[blink1073]

LGTM