Update code base for Python 3.8 and above

Result of: pipx run pyupgrade --py38-plus pelican/**/*.py

pelican/tests/build_test/test_build_files.py

@@ -61,6 +61,6 @@ def test_sdist_contents(pytestconfig, expected_file):
         filtered_values = [
             path
             for path in files_list
-            if match(f"^pelican-\d\.\d\.\d/{expected_file}{dir_matcher}$", path)
+            if match(rf"^pelican-\d\.\d\.\d/{expected_file}{dir_matcher}$", path)
         ]
         assert len(filtered_values) > 0

pelican/tests/support.py

@@ -133,7 +133,7 @@ def skipIfNoExecutable(executable):
             res = None
 
     if res is None:
-        return unittest.skip("{} executable not found".format(executable))
+        return unittest.skip(f"{executable} executable not found")
 
     return lambda func: func
 

pelican/tests/test_readers.py

@@ -32,9 +32,7 @@ class ReaderTest(unittest.TestCase):
                     % (key, value, real_value),
                 )
             else:
-                self.fail(
-                    "Expected %s to have value %s, but was not in Dict" % (key, value)
-                )
+                self.fail(f"Expected {key} to have value {value}, but was not in Dict")
 
 
 class TestAssertDictHasSubset(ReaderTest):

pelican/tests/test_settings.py

@@ -170,7 +170,7 @@ class TestSettingsConfiguration(unittest.TestCase):
 
     def test__printf_s_to_format_field(self):
         for s in ("%s", "{%s}", "{%s"):
-            option = "foo/{}/bar.baz".format(s)
+            option = f"foo/{s}/bar.baz"
             result = _printf_s_to_format_field(option, "slug")
             expected = option % "qux"
             found = result.format(slug="qux")