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  • ashwinvis · 3 ✖

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  • Dask error when importing pip installed xarray. · 3 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
985473412 https://github.com/pydata/xarray/issues/5841#issuecomment-985473412 https://api.github.com/repos/pydata/xarray/issues/5841 IC_kwDOAMm_X846vSGE ashwinvis 9155111 2021-12-03T12:17:51Z 2021-12-03T12:33:59Z CONTRIBUTOR

See also #5236 which could be related which uses conda.

I tried to scour through pip and pytest issues, but I can't find a discussion on this. pip and pytest and pycacheare too generic keywords. I even found pytest plugin to remove bytecode but it does not work ~~anymore~~ for me.

I proposed a fix in #6039, which I believe is good to have, as you can't expect every user to execute with python -B or set PYTHONDONTWRITEBYTECODE while running tests.

 
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   Dask error when importing pip installed xarray. 1019478260
985386101 https://github.com/pydata/xarray/issues/5841#issuecomment-985386101 https://api.github.com/repos/pydata/xarray/issues/5841 IC_kwDOAMm_X846u8x1 ashwinvis 9155111 2021-12-03T10:02:51Z 2021-12-03T10:02:51Z CONTRIBUTOR

This in my opinion is a cascade of multiple issues: - pytest creates special bytecode - pip does not clean the whole __pycache__ directory on uninstall - xarray.pycompat.is_duck_dask_array uses importlib.import_module('dask') to determine if it is installed.

 
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   Dask error when importing pip installed xarray. 1019478260
985379668 https://github.com/pydata/xarray/issues/5841#issuecomment-985379668 https://api.github.com/repos/pydata/xarray/issues/5841 IC_kwDOAMm_X846u7NU ashwinvis 9155111 2021-12-03T09:53:46Z 2021-12-03T09:53:46Z CONTRIBUTOR

@twhughes @keewis In my case, I encounter this when I: - Have xarray + dask installed in my environment - Run any pytest which imports xarray (which in turn imports dask) - Uninstall dask, but pytest artefacts remain:

sh ❯ ls venv/lib/python3.9/site-packages/dask/__pycache__ utils_test.cpython-39-pytest-6.2.5.pyc

Here are the steps which would hopefully reproduce the behaviour:

```py

Create this small unit test named:

test_import_xarray.py

def test_xr(): import xarray ```

```sh python -m venv venv source venv/bin/activate pip install xarray pytest dask pytest test_import_xarray.py

pip uninstall dask ls venv/lib/python3.9/site-packages/dask/pycache # See output above python -c 'import dask' # No ImportError! python -c 'import xarray' ```

Exact versions used Python 3.9.9 along with: ```sh

requirements.txt

attrs==21.2.0 cloudpickle==2.0.0 dask==2021.11.2 fsspec==2021.11.1 iniconfig==1.1.1 locket==0.2.1 numpy==1.21.4 packaging==21.3 pandas==1.3.4 partd==1.2.0 pluggy==1.0.0 py==1.11.0 pyparsing==3.0.6 pytest==6.2.5 python-dateutil==2.8.2 pytz==2021.3 PyYAML==6.0 six==1.16.0 toml==0.10.2 toolz==0.11.2 xarray==0.20.1 ```

 
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   Dask error when importing pip installed xarray. 1019478260

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