Add mapping-style get method to CF accessors#658
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Summary
CFAccessor.get()that delegates to each accessor's existing__getitem__implementationNoneor a caller-provided default only when CF lookup raisesKeyErrorFixes #127.
Verification
uvx ruff check cf_xarray/accessor.py cf_xarray/tests/test_accessor.pyuvx ruff format --check cf_xarray/accessor.py cf_xarray/tests/test_accessor.pyuv run --group test pytest cf_xarray/tests/test_accessor.py -q(216 passed, 1 skipped)AI assistance
I used Codex to inspect the shared accessor hierarchy and draft the implementation and tests. I reviewed the behavior against both Dataset and DataArray accessors and can maintain the submitted changes.