Python >= 3.9 required

Hasn't been CI'd with Python 3.8 in many months.

pyproject.toml

@@ -14,7 +14,7 @@ classifiers = [
   "Programming Language :: Python :: 3",
   "Topic :: Scientific/Engineering :: Atmospheric Science"
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dynamic = ["version", "readme"]
 dependencies = ["python-dateutil", "numpy", "xarray>=0.16.0", "scipy", "h5py", "matplotlib >= 3.1"]
 

scripts/plot_all_subdir.py

@@ -10,13 +10,9 @@
 import concurrent.futures
 import itertools
 import os
-import sys
 
 import gemini3d.plot as plot
 
-if sys.version_info < (3, 9):
-    raise RuntimeError("Python 3.9 or later is required")
-
 
 def plot_dir(d: Path, resume: bool) -> None:
     if resume and (d / "plots").is_dir():

src/gemini3d/plot/cartesian.py

@@ -260,7 +260,6 @@ def plot3d_slice(
     clim: tuple[float, float],
     ref_alt: float,
 ) -> None:
-
     axs = fg.subplots(1, 3, sharey=False, sharex=False)  # type: T.Any
     # fg.suptitle(f"{name}: {time.isoformat()}  {meta['commit']}", y=0.98)
     # %% CONVERT TO DISTANCE UP, EAST, NORTH (left panel)

src/gemini3d/plot/render.py

@@ -65,7 +65,9 @@ def frame(
 
         if saveplot_fmt:
             plot_fn = (
-                direc / "plots" / f"{k}-{time.isoformat().replace(':', '')}.{saveplot_fmt}"
+                direc
+                / "plots"
+                / f"{k}-{time.isoformat().replace(':', '')}.{saveplot_fmt}"
             )
             plot_fn.parent.mkdir(exist_ok=True)
             print(f"{dat['time']} => {plot_fn}")

src/gemini3d/utils.py

@@ -4,7 +4,6 @@
 import shutil
 from pathlib import Path
 import importlib.resources as pkgr
-import sys
 
 from datetime import datetime, timedelta
 import typing as T
@@ -41,12 +40,8 @@ def get_pkg_file(package: str, filename: str) -> Path:
     NOTE: this probably assumes the install is Zip safe
     """
 
-    if sys.version_info < (3, 9):
-        with pkgr.path(package, filename) as f:
-            return f
-    else:
-        with pkgr.as_file(pkgr.files(package).joinpath(filename)) as f:
-            return f
+    with pkgr.as_file(pkgr.files(package).joinpath(filename)) as f:
+        return f
 
 
 def str2func(name: str, path: Path | None = None) -> T.Callable:
@@ -228,7 +223,7 @@ def get_cpu_count() -> int:
     try:
         import psutil
 
-        max_cpu = psutil.cpu_count(logical=False)
+        max_cpu: int | None = psutil.cpu_count(logical=False)
         if max_cpu is None:
             max_cpu = psutil.cpu_count()
             extradiv = 2