issues: 871111282

When I try to run xarray's test suite locally with pytest I've suddenly started getting this weird error:

``` (xarray-dev) tegn500@fusion192:~/Documents/Work/Code/xarray$ pytest xarray/tests/test_backends.py ==================================================================================== test session starts ===================================================================================== platform linux -- Python 3.9.2, pytest-6.2.3, py-1.10.0, pluggy-0.13.1 rootdir: /home/tegn500/Documents/Work/Code/xarray, configfile: setup.cfg collected 0 items / 1 error

=========================================================================================== ERRORS =========================================================================================== __________ ERROR collecting xarray/tests/test_backends.py __________ ../../../../anaconda3/envs/xarray-dev/lib/python3.9/importlib/init.py:127: in import_module return _bootstrap._gcd_import(name[level:], package, level) <frozen importlib._bootstrap>:1030: in _gcd_import ??? <frozen importlib._bootstrap>:1007: in _find_and_load ??? <frozen importlib._bootstrap>:972: in _find_and_load_unlocked ??? <frozen importlib._bootstrap>:228: in _call_with_frames_removed ??? <frozen importlib._bootstrap>:1030: in _gcd_import ??? <frozen importlib._bootstrap>:1007: in _find_and_load ??? <frozen importlib._bootstrap>:986: in _find_and_load_unlocked ??? <frozen importlib._bootstrap>:680: in _load_unlocked ??? <frozen importlib._bootstrap_external>:790: in exec_module ??? <frozen importlib._bootstrap>:228: in _call_with_frames_removed ??? xarray/tests/init.py:84: in <module> has_pint_0_15, requires_pint_0_15 = _importorskip("pint", minversion="0.15") xarray/tests/init.py:46: in _importorskip if LooseVersion(mod.version) < LooseVersion(minversion): E AttributeError: module 'pint' has no attribute 'version' ================================================================================== short test summary info =================================================================================== ERROR xarray/tests/test_backends.py - AttributeError: module 'pint' has no attribute 'version' !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! ====================================================================================== 1 error in 0.88s ====================================================================================== ```

I'm not sure whether this is my fault or a problem with xarray somehow. @keewis have you seen this happen before? This is with a fresh conda environment, running locally on my laptop, and on python 3.9.2. Pint isn't even in this environment. I can force it to proceed with the tests by also catching the attribute error, i.e.

python def _importorskip(modname, minversion=None): try: mod = importlib.import_module(modname) has = True if minversion is not None: if LooseVersion(mod.__version__) < LooseVersion(minversion): raise ImportError("Minimum version not satisfied") except (ImportError, AttributeError): has = False

but I obviously shouldn't need to do that. Any ideas?

Environment:

Conda Environment: