diff --git a/coverage/config.py b/coverage/config.py
index 0b0cab30c..7c7dbe19f 100644
--- a/coverage/config.py
+++ b/coverage/config.py
@@ -521,10 +521,10 @@ def post_process(self) -> None:
         self.data_file = self.post_process_file(self.data_file)
         self.html_dir = self.post_process_file(self.html_dir)
         self.xml_output = self.post_process_file(self.xml_output)
-        self.paths = dict(
-            (k, [self.post_process_file(f) for f in v])
+        self.paths = {
+            k: [self.post_process_file(f) for f in v]
             for k, v in self.paths.items()
-        )
+        }
         self.exclude_list += self.exclude_also
 
     def debug_info(self) -> List[Tuple[str, Any]]:
diff --git a/tests/balance_xdist_plugin.py b/tests/balance_xdist_plugin.py
index aec7dc21c..17dd9c9e2 100644
--- a/tests/balance_xdist_plugin.py
+++ b/tests/balance_xdist_plugin.py
@@ -117,7 +117,7 @@ def pytest_xdist_make_scheduler(self, config, log):
         clumped = set()
         clumps = config.getini("balanced_clumps")
         for i, clump_word in enumerate(clumps):
-            clump_nodes = set(nodeid for nodeid in self.times.keys() if clump_word in nodeid)
+            clump_nodes = {nodeid for nodeid in self.times.keys() if clump_word in nodeid}
             i %= nchunks
             tests[i].update(clump_nodes)
             totals[i] += sum(self.times[nodeid] for nodeid in clump_nodes)
diff --git a/tests/test_lcov.py b/tests/test_lcov.py
index a3332081e..9d9ea8502 100644
--- a/tests/test_lcov.py
+++ b/tests/test_lcov.py
@@ -44,7 +44,7 @@ def test_volume(self):
 
     def get_lcov_report_content(self, filename: str = "coverage.lcov") -> str:
         """Return the content of an LCOV report."""
-        with open(filename, "r") as file:
+        with open(filename) as file:
             return file.read()
 
     def test_lone_file(self) -> None: