Drop support for Python 2.7

The ship has long sailed, and while we could even restrict Python
version support further, the module itself uses few and stable function
calls that haven't changed throughout the Python 3 series.

Signed-off-by: Rodrigo Tobar <[email protected]>

CHANGELOG.md

@@ -12,6 +12,7 @@
   for clarity, and to avoid potential warnings (#46).
 * Run test against different memory alignments.
 * Mention explicit support for Python 3.13.
+* Drop support for Python 2.7.
 
 ## [2.4.1]
 

setup.py

@@ -36,7 +36,6 @@
     "License :: OSI Approved :: GNU Lesser General Public License v2 or later (LGPLv2+)",
     "Operating System :: OS Independent",
     "Programming Language :: C",
-    "Programming Language :: Python :: 2.7",
     "Programming Language :: Python :: 3.2",
     "Programming Language :: Python :: 3.3",
     "Programming Language :: Python :: 3.4",
@@ -67,6 +66,7 @@
       classifiers=classifiers,
       packages=['crc32c'],
       package_dir={'': 'src'},
+      python_requires=">=3.2",
       include_package_data=True,
       ext_modules=[crcmod_ext],
       test_suite="test")

src/crc32c/ext/_crc32c.c

@@ -56,13 +56,7 @@ PyObject* crc32c_crc32c(PyObject *self, PyObject *args, PyObject *kwargs) {
 	static char *kwlist[] = {"data", "value", "gil_release_mode", NULL};
 
 	/* In python 3 we accept only bytes-like objects */
-	const char *format =
-#if PY_MAJOR_VERSION >= 3
-	"y*"
-#else
-	"s*"
-#endif
-	"|Ii:crc32";
+	const char *format ="y*|Ii:crc32";
 
 	if (!PyArg_ParseTupleAndKeywords(args, kwargs, format, kwlist, &pbin, &crc, &gil_release_mode) )
 		return NULL;
@@ -133,21 +127,9 @@ static const char *import_error_msg = "\n\n"
 " * 'force': use software implementation regardless of hardware support.\n"
 " * 'none': fail if no hardware support is found (this error).\n";
 
-/* Support for Python 2/3 */
-#if PY_MAJOR_VERSION >= 3
 static struct PyModuleDef moduledef = {PyModuleDef_HEAD_INIT, "_crc32c", "crc32c implementation in hardware and software", -1, CRC32CMethods};
-	#define MOD_INIT(name) PyMODINIT_FUNC PyInit_##name(void)
-	#define MOD_DEF(m, name, doc, methods) \
-		m = PyModule_Create(&moduledef);
-	#define MOD_VAL(v) v
-#else
-	#define MOD_INIT(name) PyMODINIT_FUNC init##name(void)
-	#define MOD_DEF(m, name, doc, methods) \
-		m = Py_InitModule3(name, methods, doc);
-	#define MOD_VAL(v)
-#endif
 
-MOD_INIT(_crc32c)
+PyMODINIT_FUNC PyInit__crc32c(void)
 {
 	PyObject *m;
 	PyObject *hardware_based;
@@ -178,21 +160,21 @@ MOD_INIT(_crc32c)
 	}
 	else if (sw_mode == NONE) {
 		PyErr_SetString(PyExc_ImportError, import_error_msg);
-		return MOD_VAL(NULL);
+		return NULL;
 	}
 
 	is_big_endian = (*(const char *)(&n) == 0);
 
-	MOD_DEF(m, "_crc32c", "crc32c implementation in hardware and software", CRC32CMethods);
+	m = PyModule_Create(&moduledef);
 	if (m == NULL) {
-		return MOD_VAL(NULL);
+		return NULL;
 	}
 	Py_INCREF(hardware_based);
 	if (PyModule_AddObject(m, "hardware_based", hardware_based) < 0) {
-		return MOD_VAL(NULL);
+		return NULL;
 	}
 	if (PyModule_AddIntConstant(m, "big_endian", is_big_endian) < 0) {
-		return MOD_VAL(NULL);
+		return NULL;
 	}
-	return MOD_VAL(m);
+	return m;
 }