Xarray accessor updates to remove automatic quantification and in-place operations #1378
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Description Of Changes
Based on lingering discussions (particularly in #1354), this PR implements a few cleanups on the xarray accessors needed for work on #1353 to continue, namely, removing automatic conversion to quantities in
parse_cf
(since its loading of data into memory can cause errors) and making sure all operations are not in-place. There is one place where "side effects" still occur (caching of the coordinate parsing results in the _metpy_axis attribute), but I figured this was still okay (and hard to avoid, since it is invoked when using a property).Also, I've left this PR in draft status, since it depends on #1372 for Cartopy 0.18 fixes and #1373 for flake8/pylint fixes.
Checklist