Update supported Python versions.

setup.py

@@ -95,11 +95,11 @@ def read(*rnames):
           'License :: OSI Approved :: Zope Public License',
           'Programming Language :: Python',
           'Programming Language :: Python :: 3',
-          'Programming Language :: Python :: 3.7',
-          'Programming Language :: Python :: 3.8',
           'Programming Language :: Python :: 3.9',
           'Programming Language :: Python :: 3.10',
           'Programming Language :: Python :: 3.11',
+          'Programming Language :: Python :: 3.12',
+          'Programming Language :: Python :: 3.13',
           'Programming Language :: Python :: Implementation :: CPython',
           'Programming Language :: Python :: Implementation :: PyPy',
           'Natural Language :: English',
@@ -112,7 +112,7 @@ def read(*rnames):
       packages=find_packages('src'),
       package_dir={'': 'src'},
       namespace_packages=['zc'],
-      python_requires='>=3.7',
+      python_requires='>=3.9',
       extras_require={
           'test': tests_require,
           'browser': [

src/zc/catalog/index.py

@@ -482,8 +482,8 @@ def set_resolution(value, resolution):
     resolution += 2
     if resolution < 6:
         args = []
-        args.extend(value.timetuple()[:resolution+1])
-        args.extend([0]*(6-resolution))
+        args.extend(value.timetuple()[:resolution + 1])
+        args.extend([0] * (6 - resolution))
         args.append(value.tzinfo)
         value = datetime.datetime(*args)
     return value

src/zc/catalog/interfaces.py

@@ -113,7 +113,7 @@ class ISelfPopulatingExtent(IExtent):
         description=_(
             "Flag indicating whether self-population has been performed."),
         readonly=True,
-        )
+    )
 
     def populate():
         """Populate the extent based on the current content of the database.

src/zc/catalog/stemmer.py

@@ -20,13 +20,13 @@
 broken = None
 try:
     from zopyx.txng3.ext import stemmer
-except ImportError:  # pragma: no cover
+except ModuleNotFoundError:  # pragma: no cover
     try:
         from zopyx.txng3 import stemmer
-    except ImportError:
+    except ModuleNotFoundError:
         try:
             import txngstemmer as stemmer
-        except ImportError:
+        except ModuleNotFoundError:
             stemmer = None
 
             class Broken: