diff --git a/esl_reader.py b/esl_reader.py
index b614de9..c6d5e81 100755
--- a/esl_reader.py
+++ b/esl_reader.py
@@ -105,7 +105,7 @@ class MainWindow(QMainWindow, Ui_MainWindow):
     def addPerson(self) -> None:
         dlg = PersonDialog()
         dlg.exec()
-        model = cast(QSqlQueryModel,self.peopleView.model())
+        model = cast(QSqlQueryModel, self.peopleView.model())
         assert model is not None
         model.setQuery(model.query())
         return
diff --git a/lib/preferences.py b/lib/preferences.py
index ffa9055..3588b26 100644
--- a/lib/preferences.py
+++ b/lib/preferences.py
@@ -1,6 +1,5 @@
 import json
 import os
-import re
 from typing import Any, Dict, List, Optional, Self, Type, cast
 
 from PyQt6.QtCore import (
@@ -12,7 +11,7 @@ from PyQt6.QtCore import (
     pyqtSlot,
 )
 from PyQt6.QtMultimedia import QMediaDevices
-from PyQt6.QtWidgets import QAbstractItemView, QDialog, QListWidgetItem, QWidget
+from PyQt6.QtWidgets import QAbstractItemView, QDialog
 
 from ui.Preferences import Ui_Preferences
 
@@ -64,7 +63,6 @@ class Preferences(QDialog, Ui_Preferences):
         # End OverRides
         #
         for index, output in enumerate(QMediaDevices.audioOutputs()):
-            identifier = output.id().data().decode("utf-8")
             description = output.description()
             self.alertList.addItem(description)
             self.playerList.addItem(description)
diff --git a/lib/read.py b/lib/read.py
index f702851..6678df8 100644
--- a/lib/read.py
+++ b/lib/read.py
@@ -58,9 +58,13 @@ class ReadDialog(QDialog, Ui_ReadDialog):
         self.titleLbl.setText(self.book_title)
         blockNumber = self.block
         self.paraEdit.setReadOnly(True)
-        self.paraEdit.document().setDefaultStyleSheet(styleSheet)
+        doc = self.paraEdit.document()
+        assert doc is not None
+        doc.setDefaultStyleSheet(styleSheet)
         self.defEdit.setReadOnly(True)
-        self.defEdit.document().setDefaultStyleSheet(styleSheet)
+        doc = self.defEdit.document()
+        assert doc is not None
+        doc.setDefaultStyleSheet(styleSheet)
         self.show_section(self.section_id)
         self.block = blockNumber
         self.savePosition()
@@ -74,7 +78,9 @@ class ReadDialog(QDialog, Ui_ReadDialog):
         self.nextBtn.clicked.connect(self.nextAction)
         self.prevBtn.clicked.connect(self.prevAction)
         self.sessionBtn.clicked.connect(self.timerAction)
-        self.paraEdit.verticalScrollBar().valueChanged.connect(self.scrollSlot)
+        sb = self.paraEdit.verticalScrollBar()
+        assert sb is not None
+        sb.valueChanged.connect(self.scrollSlot)
         # self.defEdit.selectionChanged.connect(self.recursiveDef)
         self.returnBtn.clicked.connect(self.returnAction)
         #
@@ -145,7 +151,9 @@ class ReadDialog(QDialog, Ui_ReadDialog):
             if not fmt.fontUnderline():
                 self.addWord(self.paraEdit)
             cursor = self.paraEdit.textCursor()
-            textBlock = self.paraEdit.document().findBlock(cursor.position())
+            doc = self.paraEdit.document()
+            assert doc is not None
+            textBlock = doc.findBlock(cursor.position())
             blockNum = textBlock.blockNumber()
             query = QSqlQuery()
             query.prepare(
@@ -581,7 +589,9 @@ class ReadDialog(QDialog, Ui_ReadDialog):
             self.phonetics = definition["phonetics"]
         else:
             self.phonetics = None
-        self.defEdit.document().clear()
+        doc = self.defEdit.document()
+        assert doc is not None
+        doc.clear()
         cursor = self.defEdit.textCursor()
         cursor.insertHtml(self.defToHtml(word, definition))
         cursor.setPosition(0)