@property
    def attrs(self):
        if self._attrs is None:
            self._attrs = OrderedDict()
        return self._attrs
Ensures that the same fname cache runs at a sequentially
dataset/ETHPy150Open pydata/xarray/xarray/core/variable.py/Variable.attrs--crossover with--dataset/ETHPy150Open nii-cloud/dodai-compute/nova/tests/test_libvirt.py/CacheConcurrencyTestCase.test_same_fname_concurrency