issue_comments: 367795719

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https://github.com/pydata/xarray/issues/1935#issuecomment-367795719 https://api.github.com/repos/pydata/xarray/issues/1935 367795719 MDEyOklzc3VlQ29tbWVudDM2Nzc5NTcxOQ== 1217238 2018-02-22T19:37:51Z 2018-02-22T19:37:51Z MEMBER

It's exciting to see people testing xarray with PyPy! Once we get this working, we should consider adding a continuous integration test.

The specific problem here seems to be dask.SerializableLock, which xarray initializes upon import: https://github.com/dask/dask/blob/de6c2a49d76066abb51085570816322f063fc5c5/dask/utils.py#L737

I think this could be reproduced with something like the following using only the standard library: ``` import weakref import threading

lock = threading.Lock()

locks = weakref.WeakValueDictionary() locks['foo'] = lock ```

This works with CPython, but maybe not with pypy.

CC @mrocklin in case he has any ideas. Otherwise if my code to reproduce works, I would suggest reporting this upstream to PyPy.

 
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