MAINT: drop Python 3.7 & 3.8 support due to EOL (#10)

* DX: add `build/` to `.gitignore`
* MAINT: modernize Python syntax to Python 3.9

.gitignore

@@ -1,6 +1,7 @@
+__pycache__/
+build/
 *.egg-info/
 *.svg
-__pycache__/
 benchmark-results/
 condaenv.*.requirements.txt
 node_modules/

pyproject.toml

@@ -18,16 +18,13 @@ classifiers = [
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
-    "Programming Language :: Python :: 3.7",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python",
     "Topic :: Software Development",
     "Typing :: Typed",
 ]
 dependencies = [
     "PyYAML",
-    "importlib-metadata; python_version<'3.8.0'",
     "jax",
     "jaxlib",
     "matplotlib",
@@ -50,7 +47,7 @@ maintainers = [
     {name = "Common Partial Wave Analysis", email = "[email protected]"},
 ]
 name = "jax-mini-benchmark"
-requires-python = ">=3.7"
+requires-python = ">=3.9"
 
 [project.optional-dependencies]
 dev = [
@@ -119,7 +116,7 @@ extend-include = ["*.ipynb"]
 preview = true
 show-fixes = true
 src = ["src"]
-target-version = "py37"
+target-version = "py39"
 
 [tool.ruff.format]
 docstring-code-format = true

src/jax_benchmark/io.py

@@ -1,15 +1,10 @@
 import logging
 import os
 import socket
-import sys
+from importlib.metadata import version
 
 import cpuinfo
 
-if sys.version_info < (3, 8):
-    from importlib_metadata import version
-else:
-    from importlib.metadata import version
-
 
 def enable_x64() -> None:
     import jax