remove @staticmethod decorators

There might have been a time when calling a static method was faster
than a regular method, but that is no longer the case. According to
micro-benchmarks, it is 70% slower in CPython 3.13 and it also makes
executing the code of a class definition slower.

test/test_config.py

@@ -223,8 +223,7 @@ class TestConfigFiles(unittest.TestCase):
         self.assertIsInstance(cfg, dict)
         self.assertTrue(cfg)
 
-    @staticmethod
-    def _load(name):
+    def _load(self, name):
         path = os.path.join(ROOTDIR, "docs", name)
         try:
             with open(path) as fp:

test/test_extractor.py

@@ -296,8 +296,7 @@ class TestExtractorWait(unittest.TestCase):
         u = self._isotime_to_seconds(until.time().isoformat()[:8])
         self.assertLessEqual(o-u, 1.0)
 
-    @staticmethod
-    def _isotime_to_seconds(isotime):
+    def _isotime_to_seconds(self, isotime):
         parts = isotime.split(":")
         return int(parts[0]) * 3600 + int(parts[1]) * 60 + int(parts[2])
 

test/test_postprocessor.py

@@ -713,8 +713,7 @@ class MetadataTest(BasePostprocessorTest):
 }
 """)
 
-    @staticmethod
-    def _output(mock):
+    def _output(self, mock):
         return "".join(
             call[1][0]
             for call in mock.mock_calls

test/test_util.py

@@ -28,11 +28,18 @@ from gallery_dl import util, text, exception  # noqa E402
 
 class TestRange(unittest.TestCase):
 
-    def test_parse_empty(self, f=util.RangePredicate._parse):
+    def setUp(self):
+        self.predicate = util.RangePredicate("")
+
+    def test_parse_empty(self):
+        f = self.predicate._parse
+
         self.assertEqual(f(""), [])
         self.assertEqual(f([]), [])
 
-    def test_parse_digit(self, f=util.RangePredicate._parse):
+    def test_parse_digit(self):
+        f = self.predicate._parse
+
         self.assertEqual(f("2"), [range(2, 3)])
 
         self.assertEqual(
@@ -42,7 +49,9 @@ class TestRange(unittest.TestCase):
              range(4, 5)],
         )
 
-    def test_parse_range(self, f=util.RangePredicate._parse):
+    def test_parse_range(self):
+        f = self.predicate._parse
+
         self.assertEqual(f("1-2"), [range(1, 3)])
         self.assertEqual(f("2-"), [range(2, sys.maxsize)])
         self.assertEqual(f("-3"), [range(1, 4)])
@@ -62,7 +71,9 @@ class TestRange(unittest.TestCase):
              range(2, 7)],
         )
 
-    def test_parse_slice(self, f=util.RangePredicate._parse):
+    def test_parse_slice(self):
+        f = self.predicate._parse
+
         self.assertEqual(f("2:4")  , [range(2, 4)])
         self.assertEqual(f("3::")  , [range(3, sys.maxsize)])
         self.assertEqual(f(":4:")  , [range(1, 4)])