lint: since we moved to python 3.9, let's bump ruff's target to 3.9, too

.ruff.toml

@@ -42,8 +42,8 @@ dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"
 # Whether to enable preview mode. When preview mode is enabled, Ruff will use unstable rules and fixes.
 preview = true
 
-# Assume Python 3.8
-target-version = "py38"
+# Assume Python 3.9
+target-version = "py39"
 
 [per-file-ignores]
 "examples/docker-sir.py" = ["INP001", "T201"]

black_it/calibrator.py

@@ -22,7 +22,7 @@
 import time
 import warnings
 from pathlib import Path
-from typing import TYPE_CHECKING, Callable, Sequence, cast
+from typing import TYPE_CHECKING, Callable, cast
 
 import numpy as np
 from joblib import Parallel, delayed  # type: ignore[import]
@@ -39,6 +39,7 @@
 
 if TYPE_CHECKING:
     import os
+    from collections.abc import Sequence
 
     from numpy.typing import NDArray
 

black_it/loss_functions/base.py

@@ -18,13 +18,16 @@
 from __future__ import annotations
 
 from abc import ABC, abstractmethod
-from typing import Callable, Optional, Sequence
+from typing import TYPE_CHECKING, Callable, Optional
 
 import numpy as np
 from numpy.typing import NDArray
 
 from black_it.utils.base import _assert
 
+if TYPE_CHECKING:
+    from collections.abc import Sequence
+
 TimeSeriesFilter = Optional[Callable[[NDArray[np.float64]], NDArray[np.float64]]]
 """A filter that receives a time series and returns its filtered version. Used by the BaseLoss constructor."""
 

black_it/plot/plot_results.py

@@ -19,7 +19,7 @@
 
 import pickle  # nosec B403
 from pathlib import Path
-from typing import TYPE_CHECKING, Collection
+from typing import TYPE_CHECKING
 
 import matplotlib.pyplot as plt  # type: ignore[import]
 import numpy as np
@@ -31,6 +31,7 @@
 
 if TYPE_CHECKING:
     import os
+    from collections.abc import Collection
 
 
 def _get_samplers_id_table(saving_folder: str | os.PathLike) -> dict[str, int]:

black_it/samplers/halton.py

@@ -18,14 +18,16 @@
 from __future__ import annotations
 
 import itertools
-from typing import TYPE_CHECKING, Iterator
+from typing import TYPE_CHECKING
 
 import numpy as np
 
 from black_it.samplers.base import BaseSampler
 from black_it.utils.base import check_arg, digitize_data
 
 if TYPE_CHECKING:
+    from collections.abc import Iterator
+
     from numpy.typing import NDArray
 
     from black_it.search_space import SearchSpace

black_it/schedulers/base.py

@@ -19,11 +19,13 @@
 
 import contextlib
 from abc import ABC, abstractmethod
-from typing import TYPE_CHECKING, Generator, Sequence
+from typing import TYPE_CHECKING
 
 from black_it.utils.seedable import BaseSeedable
 
 if TYPE_CHECKING:
+    from collections.abc import Generator, Sequence
+
     import numpy as np
     from numpy.typing import NDArray
 

black_it/schedulers/rl/rl_scheduler.py

@@ -18,7 +18,7 @@
 from __future__ import annotations
 
 import threading
-from typing import TYPE_CHECKING, List, Sequence, cast
+from typing import TYPE_CHECKING, cast
 
 import numpy as np
 
@@ -27,6 +27,7 @@
 from black_it.schedulers.base import BaseScheduler
 
 if TYPE_CHECKING:
+    from collections.abc import Sequence
     from queue import Queue
 
     from numpy._typing import NDArray
@@ -103,7 +104,7 @@ def _add_or_get_bootstrap_sampler(
             return samplers, sampler_types[HaltonSampler]
 
         new_sampler = HaltonSampler(batch_size=1)
-        return tuple(list(samplers) + cast(List[BaseSampler], [new_sampler])), len(
+        return tuple(list(samplers) + cast(list[BaseSampler], [new_sampler])), len(
             samplers,
         )
 

black_it/utils/json_pandas_checkpointing.py

@@ -20,7 +20,7 @@
 import json
 import pickle  # nosec B403
 from pathlib import Path
-from typing import TYPE_CHECKING, Mapping
+from typing import TYPE_CHECKING
 
 import numpy as np
 import pandas as pd  # type: ignore[import]
@@ -29,6 +29,8 @@
 from black_it.utils.base import NumpyArrayEncoder, PathLike
 
 if TYPE_CHECKING:
+    from collections.abc import Mapping
+
     from numpy.typing import NDArray
 
     from black_it.loss_functions.base import BaseLoss

black_it/utils/sqlite3_checkpointing.py

@@ -23,12 +23,14 @@
 import pickle  # nosec B403
 import sqlite3
 from pathlib import Path
-from typing import TYPE_CHECKING, Mapping, Sequence
+from typing import TYPE_CHECKING
 
 import numpy as np
 from numpy.typing import NDArray
 
 if TYPE_CHECKING:
+    from collections.abc import Mapping, Sequence
+
     from black_it.loss_functions.base import BaseLoss
     from black_it.samplers.base import BaseSampler
     from black_it.utils.base import PathLike

examples/models/economics/brock_hommes.py

@@ -17,12 +17,14 @@
 """Implementation of the model in (Brock and Hommes, 1998)."""
 from __future__ import annotations
 
-from typing import TYPE_CHECKING, Sequence
+from typing import TYPE_CHECKING
 
 import numpy as np
 from scipy.special import softmax
 
 if TYPE_CHECKING:
+    from collections.abc import Sequence
+
     from numpy.typing import NDArray
 
 

examples/models/simple_models.py

@@ -28,12 +28,14 @@
 """
 from __future__ import annotations
 
-from typing import TYPE_CHECKING, Sequence
+from typing import TYPE_CHECKING
 
 import numpy as np
 from scipy.stats import alpha, bernoulli
 
 if TYPE_CHECKING:
+    from collections.abc import Sequence
+
     from numpy.typing import NDArray
 
 

tests/test_examples/base.py

@@ -16,8 +16,8 @@
 
 """Base module for example tests."""
 import sys
+from collections.abc import Sequence
 from pathlib import Path
-from typing import Sequence
 
 import pytest
 

tests/test_plot/base.py

@@ -20,11 +20,14 @@
 import logging
 from pathlib import Path
 from tempfile import TemporaryDirectory
-from typing import Any, Callable, Sequence
+from typing import TYPE_CHECKING, Any, Callable
 
 import matplotlib.pyplot as plt  # type: ignore[import]
 from matplotlib.testing.compare import compare_images  # type: ignore[import]
 
+if TYPE_CHECKING:
+    from collections.abc import Sequence
+
 
 class BasePlotTest:
     """Base test class for plotting functions."""

tests/test_plot/test_plot_descriptive_statistics.py

@@ -17,7 +17,7 @@
 """This test module contains tests for the plot_descriptive_statistics.py module."""
 from __future__ import annotations
 
-from typing import Any, Sequence
+from typing import TYPE_CHECKING, Any
 
 import numpy as np
 
@@ -26,6 +26,9 @@
 from tests.test_plot.base import BasePlotTest
 from tests.utils.base import skip_on_windows
 
+if TYPE_CHECKING:
+    from collections.abc import Sequence
+
 
 @skip_on_windows()
 class TestTsStats(BasePlotTest):