Only suppress imports of optional external dependencies #550
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This makes the suppression of import errors consistent with which codecs depend on optional external packages. If a codec doesn't depend on any code external to
numcodecs
, then import errors shouldn't be suppressed as they are indicating an issue withnumcodecs
itself.I looked in
git blame
and there doesn't seem to be any commentary/reason given for these suppressions, and they all seem to have been added in the original PRs where each codec was added.This came up over at zarr-developers/zarr-python#2032.