Bump Python version to 3.12 and add pyupgrade for modernization

.github/workflows/ci.yml

@@ -23,7 +23,6 @@ jobs:
           - "3.14"
           - "3.13"
           - "3.12"
-          - "3.11"
     steps:
       - name: Setup python for test ${{ matrix.py }}
         uses: actions/setup-python@v7

.gitignore

@@ -83,7 +83,7 @@ profile_default/
 ipython_config.py
 
 # pyenv
-.python-version
+#.python-version
 
 # pipenv
 #   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.

.python-version

@@ -0,0 +1 @@
+3.12

pyproject.toml

@@ -13,7 +13,6 @@ classifiers = [
     "Intended Audience :: Developers",
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: 3.14",
@@ -27,7 +26,7 @@ maintainers = [
     {name="Hans Spaans", email="hspaans@gmail.com"},
 ]
 
-requires-python = ">= 3.11,<3.15"
+requires-python = ">= 3.12,<3.15"
 
 dependencies = [
 ]
@@ -62,6 +61,7 @@ lint = [
     "flake8-rst-docstrings",
     "flake8-isort",
     "pymarkdownlnt",
+    "pyupgrade",
     "rstcheck",
     "yamllint",
 ]
@@ -111,7 +111,7 @@ skips = ["B101", "B601", "S101"]
 
 [tool.tox]
 requires = ["tox>=4.52.1,<5.0.0"]
-env_list = ["lint", "fix", "3.14", "3.13", "3.12", "3.11", "cov", "type", "pkg_meta"]
+env_list = ["lint", "fix", "3.14", "3.13", "3.12", "cov", "type", "pkg_meta"]
 skip_missing_interpreters = true
 
 [tool.tox.env_run_base]
@@ -155,3 +155,15 @@ commands = [
     ["pymarkdownlnt", "scan", "."],
     ["python", "-c", 'print(r"{env_python}")'],
 ]
+
+[tool.tox.env.fix]
+description = "running pyupgrade at {envdir}"
+package = "editable"
+dependency_groups = ["lint", "test"]
+allowlist_externals = ["git", "sh"]
+commands = [
+    # Finds all tracked .py files and updates them to Python 3.12+ syntax
+    ["sh", "-c", "git ls-files '*.py' | xargs pyupgrade --py312-plus"],
+    # Fails the build if pyupgrade modified any files (perfect for CI)
+    ["git", "diff", "--exit-code"]
+]

src/m6502/processor.py

@@ -777,7 +777,7 @@ def _ins_lda_inx(self) -> None:
         The instruction costs 2 bytes and 6 cycles to complete.
         """
         self.reg_a = self._read_byte(
-            self._read_word(((self._fetch_byte() + self.reg_x) & 0xFF))
+            self._read_word((self._fetch_byte() + self.reg_x) & 0xFF)
         )
         self._evaluate_flags_nz(self.reg_a)
         self.cycles += 1  # TODO: Why is the extra cycle required?
@@ -1261,9 +1261,7 @@ def _ins_sta_inx(self) -> None:
         The instruction costs 2 bytes and 6 cycles to complete.
         """
         self._write_byte(
-            self._read_byte(
-                self._read_word(((self._fetch_byte() + self.reg_x) & 0xFF))
-            ),
+            self._read_byte(self._read_word((self._fetch_byte() + self.reg_x) & 0xFF)),
             self.reg_a,
         )