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1317646082 https://github.com/pydata/xarray/pull/7179#issuecomment-1317646082 https://api.github.com/repos/pydata/xarray/issues/7179 IC_kwDOAMm_X85Oia8C headtr1ck 43316012 2022-11-16T20:44:36Z 2022-11-16T20:46:15Z COLLABORATOR

I don't think this is a bug in importlib but rather pyodide. They seem to add a hook to importlib (which is allowed, but probably causing this issue?)

Edit: The error message from pyodide seems more like this is intentional? Is scipy really installed correctly?

 
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   Lazy Imports 1412019155
1288072721 https://github.com/pydata/xarray/pull/7179#issuecomment-1288072721 https://api.github.com/repos/pydata/xarray/issues/7179 IC_kwDOAMm_X85Mxm4R headtr1ck 43316012 2022-10-23T10:02:46Z 2022-10-23T10:02:46Z COLLABORATOR

It seems that cfgrib has its own xarray_plugin now. Should the internal version be deprecated?

 
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   Lazy Imports 1412019155
1287920868 https://github.com/pydata/xarray/pull/7179#issuecomment-1287920868 https://api.github.com/repos/pydata/xarray/issues/7179 IC_kwDOAMm_X85MxBzk headtr1ck 43316012 2022-10-22T21:10:53Z 2022-10-22T21:10:53Z COLLABORATOR

I managed to get dask.array lazy as well, but dask.utils is still imported by backends.locks.

Someone else has to tackle this, I am not too familiar with this...

This got the import time quite low. I am happy with this now :)

 
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   Lazy Imports 1412019155
1287814936 https://github.com/pydata/xarray/pull/7179#issuecomment-1287814936 https://api.github.com/repos/pydata/xarray/issues/7179 IC_kwDOAMm_X85Mwn8Y headtr1ck 43316012 2022-10-22T14:47:16Z 2022-10-22T21:09:25Z COLLABORATOR

Seems like it is but a good idea to mess with sys.modules in pytest. Anyone got an idea how to solve that?

Edit: solved :)

 
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   Lazy Imports 1412019155
1287807063 https://github.com/pydata/xarray/pull/7179#issuecomment-1287807063 https://api.github.com/repos/pydata/xarray/issues/7179 IC_kwDOAMm_X85MwmBX headtr1ck 43316012 2022-10-22T14:15:48Z 2022-10-22T14:17:19Z COLLABORATOR

Now I have made every module lazy that is not too much work, this includes: matplotlib, flox and all backends.

The only remaining large import is dask.array, here I have to check if that is possible to make lazy? This alone is 500ms import time, since it also imports numba, scipy and sparse... Maybe we could even open a ticket at dask about this topic as well?

 
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   Lazy Imports 1412019155
1283016719 https://github.com/pydata/xarray/pull/7179#issuecomment-1283016719 https://api.github.com/repos/pydata/xarray/issues/7179 IC_kwDOAMm_X85MeUgP headtr1ck 43316012 2022-10-18T21:18:14Z 2022-10-18T21:18:14Z COLLABORATOR

The simplest solution would be to add a simple unit test that checks that blacklisted packets are not in sys.modules.

For import timings we have asv, but that is not run so often.

 
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   Lazy Imports 1412019155
1282951823 https://github.com/pydata/xarray/pull/7179#issuecomment-1282951823 https://api.github.com/repos/pydata/xarray/issues/7179 IC_kwDOAMm_X85MeEqP headtr1ck 43316012 2022-10-18T20:16:18Z 2022-10-18T20:16:18Z COLLABORATOR

Not as much of an improvement as I thought, but shaving off another 20ms.

I can see if I can bring it down even further...

 
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   Lazy Imports 1412019155

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