Use Python 3.9 typing features

docs/developing/grass.py

@@ -1,7 +1,8 @@
 # > imports
 import enum
+from collections.abc import Hashable, Sequence
 from functools import cached_property
-from typing import Dict, Hashable, Optional, Sequence, Tuple
+from typing import Optional
 
 import numpy
 import xarray
@@ -19,7 +20,7 @@ class GrassGridKind(enum.Enum):
     fence = 'fence'
 
 
-GrassIndex = Tuple[GrassGridKind, Sequence[int]]
+GrassIndex = tuple[GrassGridKind, Sequence[int]]
 
 
 class Grass(DimensionConvention[GrassGridKind, GrassIndex]):
@@ -37,14 +38,14 @@ def check_dataset(cls, dataset: xarray.Dataset) -> Optional[int]:
             return Specificity.HIGH
         return None
 
-    def unpack_index(self, index: GrassIndex) -> Tuple[GrassGridKind, Sequence[int]]:
+    def unpack_index(self, index: GrassIndex) -> tuple[GrassGridKind, Sequence[int]]:
         return index[0], list(index[1])
 
     def pack_index(self, grid_kind: GrassGridKind, indices: Sequence[int]) -> GrassIndex:
         return (grid_kind, list(indices))
 
     @cached_property
-    def grid_dimensions(self) -> Dict[GrassGridKind, Sequence[Hashable]]:
+    def grid_dimensions(self) -> dict[GrassGridKind, Sequence[Hashable]]:
         return {
             GrassGridKind.field: ['warp', 'weft'],
             GrassGridKind.fence: ['post'],

docs/releases/development.rst

@@ -11,6 +11,9 @@ Next release (in development)
 * Drop dependency on importlib_metadata.
   This was only required to support Python 3.8, which was dropped in a previous release
   (:issue:`122`, :pr:`125`).
-* Fix an error with `ShocSimple.get_all_depth_names()`
+* Fix an error with ``ShocSimple.get_all_depth_names()``
   when the dataset had no depth coordinates
   (:issue:`123`, :pr:`126`).
+* Use `PEP 585 generic type annotations <https://peps.python.org/pep-0585/>`_
+  and stop using `PEP 563 postponed annotation evaluation <https://peps.python.org/pep-0563/>`_
+  (:issue:`109`, :pr:`127`).

docs/roles.py

@@ -1,5 +1,6 @@
 import re
-from typing import Callable, Iterable, List, Tuple, cast
+from collections.abc import Iterable
+from typing import Callable, cast
 
 import yaml
 from docutils import nodes, utils
@@ -30,7 +31,7 @@ def role_fn(
         inliner: Inliner,
         options: dict = {},
         content: list = [],
-    ) -> Tuple[list, list]:
+    ) -> tuple[list, list]:
         match = GITHUB_FULL_REF.match(utils.unescape(text))
         if match is not None:
             repo = match.group('repo')
@@ -83,15 +84,15 @@ def load_citation_file(self) -> dict:
         with open(citation_file, 'r') as f:
             return cast(dict, yaml.load(f, yaml.Loader))
 
-    def run(self) -> List[nodes.Node]:
+    def run(self) -> list[nodes.Node]:
         if self.options['format'] == 'apa':
             return self.run_apa()
         elif self.options['format'] == 'biblatex':
             return self.run_biblatex()
         else:
             raise ValueError("Unknown format")
 
-    def run_apa(self) -> List[nodes.Node]:
+    def run_apa(self) -> list[nodes.Node]:
         citation = self.load_citation_file()
         names = self.comma_ampersand_join(map(self.apa_name, citation['authors']))
         year = citation['date-released'].year
@@ -118,7 +119,7 @@ def comma_ampersand_join(self, items: Iterable[str]) -> str:
             return items[0]
         return '{}, & {}'.format(', '.join(items[:-1]), items[-1])
 
-    def run_biblatex(self) -> List[nodes.Node]:
+    def run_biblatex(self) -> list[nodes.Node]:
         citation = self.load_citation_file()
 
         year = citation['date-released'].year

scripts/release.py

@@ -6,7 +6,7 @@
 import shlex
 import subprocess
 import sys
-from typing import List, Optional
+from typing import Optional
 
 PROJECT = pathlib.Path(__file__).parent.parent
 
@@ -29,7 +29,7 @@
 
 
 def main(
-    args: Optional[List[str]] = None,
+    args: Optional[list[str]] = None,
 ) -> None:
     parser = argparse.ArgumentParser()
     add_options(parser)

src/emsarray/accessors.py

@@ -1,5 +1,3 @@
-from __future__ import annotations
-
 import logging
 
 import xarray

src/emsarray/cli/__init__.py

@@ -6,7 +6,7 @@
 import argparse
 import importlib
 import pkgutil
-from typing import Iterable, Type
+from collections.abc import Iterable
 
 import emsarray
 
@@ -40,7 +40,7 @@ def main(options: argparse.Namespace) -> None:
     options.func(options)
 
 
-def _find_all_commands() -> Iterable[Type[BaseCommand]]:
+def _find_all_commands() -> Iterable[type[BaseCommand]]:
     for moduleinfo in pkgutil.iter_modules(commands.__path__):
         if moduleinfo.name.startswith('_'):
             continue

src/emsarray/cli/commands/clip.py

@@ -3,7 +3,6 @@
 import logging
 import tempfile
 from pathlib import Path
-from typing import ContextManager
 
 import emsarray
 from emsarray.cli import BaseCommand
@@ -39,7 +38,7 @@ def add_arguments(self, parser: argparse.ArgumentParser) -> None:
             ))
 
     def handle(self, options: argparse.Namespace) -> None:
-        work_context: ContextManager[Pathish]
+        work_context: contextlib.AbstractContextManager[Pathish]
         if options.work_dir:
             work_context = contextlib.nullcontext(options.work_dir)
         else:

src/emsarray/cli/commands/export_geometry.py

@@ -1,7 +1,7 @@
 import argparse
 import logging
 from pathlib import Path
-from typing import Callable, Dict
+from typing import Callable
 
 import xarray
 
@@ -13,7 +13,7 @@
 logger = logging.getLogger(__name__)
 
 Writer = Callable[[xarray.Dataset, Pathish], None]
-format_writers: Dict[str, Writer] = {
+format_writers: dict[str, Writer] = {
     'geojson': geometry.write_geojson,
     'shapefile': geometry.write_shapefile,
     'wkt': geometry.write_wkt,

src/emsarray/cli/commands/plot.py

@@ -2,7 +2,7 @@
 import functools
 import logging
 from pathlib import Path
-from typing import Any, Callable, Dict, List, Optional, Text, TypeVar
+from typing import Any, Callable, Optional, TypeVar
 
 import emsarray
 from emsarray.cli import BaseCommand, CommandException
@@ -12,7 +12,7 @@
 logger = logging.getLogger(__name__)
 
 
-def key_value(arg: str, value_type: Callable = str) -> Dict[str, T]:
+def key_value(arg: str, value_type: Callable = str) -> dict[str, T]:
     try:
         name, value = arg.split("=", 2)
     except ValueError:
@@ -24,11 +24,11 @@ def key_value(arg: str, value_type: Callable = str) -> Dict[str, T]:
 class UpdateDict(argparse.Action):
     def __init__(
         self,
-        option_strings: List[str],
+        option_strings: list[str],
         dest: str,
         *,
         value_type: Callable = str,
-        default: Optional[Dict[str, Any]] = None,
+        default: Optional[dict[str, Any]] = None,
         **kwargs: Any,
     ):
         if default is None:
@@ -42,7 +42,7 @@ def __call__(
         parser: argparse.ArgumentParser,
         namespace: argparse.Namespace,
         values: Any,
-        option_string: Optional[Text] = None,
+        option_string: Optional[str] = None,
     ) -> None:
         super().__call__
         holder = getattr(namespace, self.dest, {})

src/emsarray/cli/utils.py

@@ -9,9 +9,10 @@
 import re
 import sys
 import textwrap
+from collections.abc import Iterator
 from functools import wraps
 from pathlib import Path
-from typing import Callable, Iterator, List, Optional, Protocol
+from typing import Callable, Optional, Protocol
 
 from shapely.geometry import box, shape
 from shapely.geometry.base import BaseGeometry
@@ -29,7 +30,7 @@
 class MainCallable(Protocol):
     def __call__(
         self,
-        argv: Optional[List[str]] = None,
+        argv: Optional[list[str]] = None,
         handle_errors: bool = True,
     ) -> None:
         ...
@@ -90,7 +91,7 @@ def main(options: argparse.Namespace) -> None:
     .. code-block:: python
 
         @nice_console_errors()
-        def main(argv: Optional[List[str]]) -> None:
+        def main(argv: Optional[list[str]]) -> None:
             parser = argparse.ArgumentParser()
             add_verbosity_group(parser)
             command_line_flags(parser)
@@ -111,7 +112,7 @@ def decorator(
     ) -> MainCallable:
         @wraps(fn)
         def wrapper(
-            argv: Optional[List[str]] = None,
+            argv: Optional[list[str]] = None,
             handle_errors: bool = True,
         ) -> None:
             parser = argparse.ArgumentParser(

src/emsarray/compat/shapely.py

@@ -1,5 +1,6 @@
 import warnings
-from typing import Generic, Iterable, Tuple, TypeVar, Union, cast
+from collections.abc import Iterable
+from typing import Generic, TypeVar, Union, cast
 
 import numpy
 import shapely
@@ -30,7 +31,7 @@ class SpatialIndex(Generic[T]):
 
     def __init__(
         self,
-        items: Union[numpy.ndarray, Iterable[Tuple[BaseGeometry, T]]],
+        items: Union[numpy.ndarray, Iterable[tuple[BaseGeometry, T]]],
     ):
         self.items = numpy.array(items, dtype=self.dtype)