issues: 776542812

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
776542812 MDExOlB1bGxSZXF1ZXN0NTQ3MDEzNjY0 4742 speedup attribute style access and tab completion 32801740 closed 0     2 2020-12-30T16:45:03Z 2021-01-05T23:00:34Z 2021-01-05T23:00:29Z CONTRIBUTOR   0 pydata/xarray/pulls/4742
  • [x] Closes #4741
  • [x] Passes isort . && black . && mypy . && flake8

  • [x] User visible changes (including notable bug fixes) are documented in whats-new.rst

  • make _attr_sources and _item_sources lazy

  • make lookup of virtual dimension coordinates lazy
  • make helper class more general so it can be used for lookup of both virtual dimension and level coordinates
 
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