Lint (#3373)

* raise exception instance, not class

* isort

* isort

* Bump mypy version

.pre-commit-config.yaml

@@ -11,7 +11,7 @@ repos:
     hooks:
       - id: flake8
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.720  # Must match ci/requirements/*.yml
+    rev: v0.730  # Must match ci/requirements/*.yml
     hooks:
       - id: mypy
   # run these occasionally, ref discussion https://github.com/pydata/xarray/pull/3194

asv_bench/benchmarks/__init__.py

@@ -18,7 +18,7 @@ def requires_dask():
     try:
         import dask  # noqa: F401
     except ImportError:
-        raise NotImplementedError
+        raise NotImplementedError()
 
 
 def randn(shape, frac_nan=None, chunks=None, seed=0):

asv_bench/benchmarks/dataset_io.py

@@ -458,7 +458,7 @@ def setup(self):
         try:
             import distributed
         except ImportError:
-            raise NotImplementedError
+            raise NotImplementedError()
         self.client = distributed.Client()
         self.write = create_delayed_write()
 

ci/requirements/py36-min-all-deps.yml

@@ -20,7 +20,7 @@ dependencies:
   - iris=2.2.0
   - lxml=4.4.1  # optional dep of pydap
   - matplotlib=3.1.1
-  - mypy==0.720  # Must match .pre-commit-config.yaml
+  - mypy==0.730  # Must match .pre-commit-config.yaml
   - nc-time-axis=1.2.0
   - netcdf4=1.5.1.2
   - numba=0.45.1

ci/requirements/py36.yml

@@ -20,7 +20,7 @@ dependencies:
   - iris>=1.10
   - lxml    # optional dep of pydap
   - matplotlib
-  - mypy==0.720  # Must match .pre-commit-config.yaml
+  - mypy==0.730  # Must match .pre-commit-config.yaml
   - nc-time-axis
   - netcdf4
   - numba

ci/requirements/py37-windows.yml

@@ -20,7 +20,7 @@ dependencies:
   - iris>=1.10
   - lxml    # optional dep of pydap
   - matplotlib
-  - mypy==0.720  # Must match .pre-commit-config.yaml
+  - mypy==0.730  # Must match .pre-commit-config.yaml
   - nc-time-axis
   - netcdf4
   - numba

ci/requirements/py37.yml

@@ -20,7 +20,7 @@ dependencies:
   - iris>=1.10
   - lxml    # optional dep of pydap
   - matplotlib
-  - mypy==0.720  # Must match .pre-commit-config.yaml
+  - mypy==0.730  # Must match .pre-commit-config.yaml
   - nc-time-axis
   - netcdf4
   - numba

properties/test_encode_decode.py

@@ -4,7 +4,7 @@
 These ones pass, just as you'd hope!
 
 """
-import pytest
+import pytest  # isort:skip
 
 pytest.importorskip("hypothesis")
 

xarray/backends/common.py

@@ -88,13 +88,13 @@ def __len__(self):
         return len(self.variables)
 
     def get_dimensions(self):  # pragma: no cover
-        raise NotImplementedError
+        raise NotImplementedError()
 
     def get_attrs(self):  # pragma: no cover
-        raise NotImplementedError
+        raise NotImplementedError()
 
     def get_variables(self):  # pragma: no cover
-        raise NotImplementedError
+        raise NotImplementedError()
 
     def get_encoding(self):
         return {}
@@ -247,13 +247,13 @@ def encode_attribute(self, a):
         return a
 
     def set_dimension(self, d, l):  # pragma: no cover
-        raise NotImplementedError
+        raise NotImplementedError()
 
     def set_attribute(self, k, v):  # pragma: no cover
-        raise NotImplementedError
+        raise NotImplementedError()
 
     def set_variable(self, k, v):  # pragma: no cover
-        raise NotImplementedError
+        raise NotImplementedError()
 
     def store_dataset(self, dataset):
         """

xarray/backends/file_manager.py

@@ -28,7 +28,7 @@ class FileManager:
 
     def acquire(self, needs_lock=True):
         """Acquire the file object from this manager."""
-        raise NotImplementedError
+        raise NotImplementedError()
 
     def acquire_context(self, needs_lock=True):
         """Context manager for acquiring a file. Yields a file object.
@@ -37,11 +37,11 @@ def acquire_context(self, needs_lock=True):
         (i.e., removes it from any cache) if an exception is raised from the
         context. It *does not* automatically close the file.
         """
-        raise NotImplementedError
+        raise NotImplementedError()
 
     def close(self, needs_lock=True):
         """Close the file object associated with this manager, if needed."""
-        raise NotImplementedError
+        raise NotImplementedError()
 
 
 class CachingFileManager(FileManager):

xarray/coding/cftime_offsets.py

@@ -181,7 +181,7 @@ def _get_day_of_month(other, day_option):
     elif day_option is None:
         # Note: unlike `_shift_month`, _get_day_of_month does not
         # allow day_option = None
-        raise NotImplementedError
+        raise NotImplementedError()
     else:
         raise ValueError(day_option)
 

xarray/coding/variables.py

@@ -36,12 +36,12 @@ class VariableCoder:
     def encode(self, variable, name=None):  # pragma: no cover
         # type: (Variable, Any) -> Variable
         """Convert an encoded variable to a decoded variable."""
-        raise NotImplementedError
+        raise NotImplementedError()
 
     def decode(self, variable, name=None):  # pragma: no cover
         # type: (Variable, Any) -> Variable
         """Convert an decoded variable to a encoded variable."""
-        raise NotImplementedError
+        raise NotImplementedError()
 
 
 class _ElementwiseFunctionArray(indexing.ExplicitlyIndexedNDArrayMixin):

xarray/core/common.py

@@ -1216,7 +1216,7 @@ def __exit__(self, exc_type, exc_value, traceback) -> None:
 
     def __getitem__(self, value):
         # implementations of this class should implement this method
-        raise NotImplementedError
+        raise NotImplementedError()
 
 
 def full_like(other, fill_value, dtype: DTypeLike = None):

xarray/core/concat.py

@@ -4,7 +4,7 @@
 
 from . import dtypes, utils
 from .alignment import align
-from .merge import unique_variable, _VALID_COMPAT
+from .merge import _VALID_COMPAT, unique_variable
 from .variable import IndexVariable, Variable, as_variable
 from .variable import concat as concat_vars
 

xarray/core/coordinates.py

@@ -6,8 +6,8 @@
     Hashable,
     Iterator,
     Mapping,
-    Set,
     Sequence,
+    Set,
     Tuple,
     Union,
     cast,
@@ -17,7 +17,7 @@
 
 from . import formatting, indexing
 from .indexes import Indexes
-from .merge import merge_coords, merge_coordinates_without_align
+from .merge import merge_coordinates_without_align, merge_coords
 from .utils import Frozen, ReprObject, either_dict_or_kwargs
 from .variable import Variable
 
@@ -53,10 +53,10 @@ def indexes(self) -> Indexes:
 
     @property
     def variables(self):
-        raise NotImplementedError
+        raise NotImplementedError()
 
     def _update_coords(self, coords, indexes):
-        raise NotImplementedError
+        raise NotImplementedError()
 
     def __iter__(self) -> Iterator["Hashable"]:
         # needs to be in the same order as the dataset variables

xarray/core/dataset.py

@@ -64,8 +64,8 @@
 from .merge import (
     dataset_merge_method,
     dataset_update_method,
-    merge_data_and_coords,
     merge_coordinates_without_align,
+    merge_data_and_coords,
 )
 from .options import OPTIONS, _get_keep_attrs
 from .pycompat import dask_array_type
@@ -76,9 +76,9 @@
     decode_numpy_dict_values,
     either_dict_or_kwargs,
     hashable,
-    maybe_wrap_array,
     is_dict_like,
     is_list_like,
+    maybe_wrap_array,
 )
 from .variable import IndexVariable, Variable, as_variable, broadcast_variables
 

xarray/tests/test_backends.py

@@ -237,7 +237,7 @@ class DatasetIOBase:
     file_format = None  # type: Optional[str]
 
     def create_store(self):
-        raise NotImplementedError
+        raise NotImplementedError()
 
     @contextlib.contextmanager
     def roundtrip(

xarray/tests/test_concat.py

@@ -6,6 +6,7 @@
 
 from xarray import DataArray, Dataset, Variable, concat
 from xarray.core import dtypes, merge
+
 from . import (
     InaccessibleArray,
     assert_array_equal,