examples: fix unused imports and minor errors in 'widgets'

Change-Id: I0aad3aefb2f036bf4edc2d0942f007045d605e26
Reviewed-by: Adrian Herrmann <adrian.herrmann@qt.io>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

3 files changed, 5 insertions, 5 deletions

diff --git a/examples/widgets/mainwindows/application/application.py b/examples/widgets/mainwindows/application/application.py
index 6fb01e912..320c421a6 100644
--- a/examples/widgets/mainwindows/application/application.py
+++ b/examples/widgets/mainwindows/application/application.py
@@ -9,7 +9,7 @@ from PySide6.QtCore import (QByteArray, QFile, QFileInfo, QSaveFile, QSettings,
                             QTextStream, Qt, Slot)
 from PySide6.QtGui import QAction, QIcon, QKeySequence
 from PySide6.QtWidgets import (QApplication, QFileDialog, QMainWindow,
-                               QMessageBox, QTextEdit, QWidget)
+                               QMessageBox, QTextEdit)
 
 import application_rc
 
diff --git a/examples/widgets/mainwindows/dockwidgets/dockwidgets.py b/examples/widgets/mainwindows/dockwidgets/dockwidgets.py
index f8d5ffe26..6d0e95a81 100644
--- a/examples/widgets/mainwindows/dockwidgets/dockwidgets.py
+++ b/examples/widgets/mainwindows/dockwidgets/dockwidgets.py
@@ -103,7 +103,7 @@ class MainWindow(QMainWindow):
         if not file.open(QFile.WriteOnly | QFile.Text):
             reason = file.errorString()
             QMessageBox.warning(self, "Dock Widgets",
-                    "Cannot write file {filename}:\n{reason}.")
+                    f"Cannot write file {filename}:\n{reason}.")
             return
 
         out = QTextStream(file)
diff --git a/examples/widgets/mainwindows/mdi/mdi.py b/examples/widgets/mainwindows/mdi/mdi.py
index de6b2b960..597479981 100644
--- a/examples/widgets/mainwindows/mdi/mdi.py
+++ b/examples/widgets/mainwindows/mdi/mdi.py
@@ -8,11 +8,11 @@ from argparse import ArgumentParser, RawTextHelpFormatter
 from functools import partial
 import sys
 
-from PySide6.QtCore import (QByteArray, QFile, QFileInfo, QPoint, QSettings,
-        QSaveFile, QSize, QTextStream, Qt, Slot)
+from PySide6.QtCore import (QByteArray, QFile, QFileInfo, QSettings,
+        QSaveFile, QTextStream, Qt, Slot)
 from PySide6.QtGui import QAction, QIcon, QKeySequence
 from PySide6.QtWidgets import (QApplication, QFileDialog, QMainWindow,
-        QMdiArea, QMessageBox, QTextEdit, QWidget)
+        QMdiArea, QMessageBox, QTextEdit)
 
 import mdi_rc