diff --git a/picard/pluginmanager.py b/picard/pluginmanager.py
index 1936bce22..cada2765e 100644
--- a/picard/pluginmanager.py
+++ b/picard/pluginmanager.py
@@ -212,7 +212,7 @@ class PluginManager(QtCore.QObject):
             self.handle_plugin_updates()
         # now load found plugins
         names = set()
-        for path in [os.path.join(plugindir, file) for file in os.listdir(plugindir)]:
+        for path in (os.path.join(plugindir, file) for file in os.listdir(plugindir)):
             name = _plugin_name_from_path(path)
             if name:
                 names.add(name)
@@ -301,9 +301,10 @@ class PluginManager(QtCore.QObject):
         dirpath = os.path.join(self.plugins_directory, plugin_name)
         if not os.path.isdir(dirpath):
             dirpath = None
+        filenames = {plugin_name + ext for ext in fileexts}
         filepaths = [os.path.join(self.plugins_directory, f)
                      for f in os.listdir(self.plugins_directory)
-                     if f in [plugin_name + ext for ext in fileexts]
+                     if f in filenames
                      ]
         return (dirpath, filepaths)
 
diff --git a/picard/ui/itemviews.py b/picard/ui/itemviews.py
index 9030e8e52..4fdc0ca5a 100644
--- a/picard/ui/itemviews.py
+++ b/picard/ui/itemviews.py
@@ -889,11 +889,11 @@ class TreeItem(QtWidgets.QTreeWidgetItem):
             obj.item = self
         self.sortable = sortable
         self._sortkeys = {}
-        for column in [
+        for column in (
             MainPanel.LENGTH_COLUMN,
             MainPanel.TRACKNUMBER_COLUMN,
             MainPanel.DISCNUMBER_COLUMN,
-        ]:
+        ):
             self.setTextAlignment(column, QtCore.Qt.AlignmentFlag.AlignRight | QtCore.Qt.AlignmentFlag.AlignVCenter)
         self.setSizeHint(MainPanel.FINGERPRINT_COLUMN, ICON_SIZE)
 
diff --git a/picard/ui/options/plugins.py b/picard/ui/options/plugins.py
index 220ccb020..4f618839f 100644
--- a/picard/ui/options/plugins.py
+++ b/picard/ui/options/plugins.py
@@ -669,7 +669,7 @@ class PluginsOptionsPage(OptionsPage):
         event.accept()
 
     def dropEvent(self, event):
-        for path in [os.path.normpath(u.toLocalFile()) for u in event.mimeData().urls()]:
+        for path in (os.path.normpath(u.toLocalFile()) for u in event.mimeData().urls()):
             self.manager.install_plugin(path)
 
 
diff --git a/test/formats/test_mp4.py b/test/formats/test_mp4.py
index 569ab4e78..3d1b7e979 100644
--- a/test/formats/test_mp4.py
+++ b/test/formats/test_mp4.py
@@ -131,7 +131,7 @@ class CommonMP4Tests:
 
         @skipUnlessTestfile
         def test_invalid_int_tag(self):
-            for tag in ['bpm', 'movementnumber', 'movementtotal', 'showmovement']:
+            for tag in ('bpm', 'movementnumber', 'movementtotal', 'showmovement'):
                 metadata = Metadata({tag: 'notanumber'})
                 loaded_metadata = save_and_load_metadata(self.filename, metadata)
                 self.assertNotIn(tag, loaded_metadata)
diff --git a/test/test_bytes2human.py b/test/test_bytes2human.py
index eb1e4b234..dadbaaa96 100644
--- a/test/test_bytes2human.py
+++ b/test/test_bytes2human.py
@@ -89,11 +89,11 @@ class Testbytes2human(PicardTestCase):
     @staticmethod
     def _create_testlist():
         values = [0, 1]
-        for n in [1000, 1024]:
+        for n in (1000, 1024):
             p = 1
             for e in range(0, 6):
                 p *= n
-                for x in [0.1, 0.5, 0.99, 0.9999, 1, 1.5]:
+                for x in (0.1, 0.5, 0.99, 0.9999, 1, 1.5):
                     values.append(int(p * x))
         list = []
         for x in sorted(values):