examples: clean and improve code

- removing '\' from long lines,
- use f-strings instead of concatenating strings
- Use f-strings instead of the old '%' formatting

Task-number: PYSIDE-841
Change-Id: I4983c25a6272e10119d5d1a74c180828ca6f64e6
Reviewed-by: Christian Tismer <[email protected]>

13 files changed, 39 insertions, 39 deletions

diff --git a/examples/widgets/animation/easing/easing.py b/examples/widgets/animation/easing/easing.py
index 24d37bd55..ba7f2d363 100644
--- a/examples/widgets/animation/easing/easing.py
+++ b/examples/widgets/animation/easing/easing.py
@@ -166,10 +166,10 @@ class Window(QWidget):
         # different curve types.  We do the Python equivalant (but without
         # cheating)
         curve_types = [(n, c) for n, c in QEasingCurve.__dict__.items()
-                        if isinstance(c, QEasingCurve.Type) \
-                            and c != QEasingCurve.Custom    \
-                            and c != QEasingCurve.NCurveTypes \
-                            and c != QEasingCurve.TCBSpline]
+                        if (isinstance(c, QEasingCurve.Type)
+                            and c != QEasingCurve.Custom
+                            and c != QEasingCurve.NCurveTypes
+                            and c != QEasingCurve.TCBSpline)]
         curve_types.sort(key=lambda ct: ct[1])
 
         painter.begin(pix)
diff --git a/examples/widgets/dialogs/classwizard/classwizard.py b/examples/widgets/dialogs/classwizard/classwizard.py
index 1daf91bbf..a7c7e2c58 100644
--- a/examples/widgets/dialogs/classwizard/classwizard.py
+++ b/examples/widgets/dialogs/classwizard/classwizard.py
@@ -65,9 +65,9 @@ BASE_CLASSES = ['<None>', 'PySide6.QtCore.QObject',
 PYTHON_TYPES = ['int', 'list', 'str']
 
 
-INTRODUCTION = """This wizard will generate a skeleton Python class definition,\
- including a few functions. You simply need to specify the class name and set\
- a few options to produce a Python file."""
+INTRODUCTION = ("This wizard will generate a skeleton Python class definition, "
+                "including a few functions. You simply need to specify the class name and set "
+                "a few options to produce a Python file.")
 
 
 def property_accessors(property_type, name):
@@ -361,14 +361,14 @@ class OutputFilesPage(QWizardPage):
         self._file_line_edit.setText(class_name.lower() + '.py')
         self.set_output_dir(QDir.tempPath())
 
-    def set_output_dir(self, dir):
-        self._output_dir_line_edit.setText(QDir.toNativeSeparators(dir))
+    def set_output_dir(self, directory):
+        self._output_dir_line_edit.setText(QDir.toNativeSeparators(directory))
 
     def output_dir(self):
         return QDir.fromNativeSeparators(self._output_dir_line_edit.text())
 
     def file_name(self):
-        return self.output_dir() + '/' + self._file_line_edit.text()
+        return f"{self.output_dir()}/{self._file_line_edit.text()}"
 
     def _choose_output_dir(self):
         directory = QFileDialog.getExistingDirectory(self, "Output Directory",
diff --git a/examples/widgets/dialogs/standarddialogs/standarddialogs.py b/examples/widgets/dialogs/standarddialogs/standarddialogs.py
index 86397adc2..fb2dbc184 100644
--- a/examples/widgets/dialogs/standarddialogs/standarddialogs.py
+++ b/examples/widgets/dialogs/standarddialogs/standarddialogs.py
@@ -75,10 +75,10 @@ class DialogOptionsWidget(QGroupBox):
 
 
 class Dialog(QDialog):
-    MESSAGE = "<p>Message boxes have a caption, a text, and up to three " \
-            "buttons, each with standard or custom texts.</p>" \
-            "<p>Click a button to close the message box. Pressing the Esc " \
-            "button will activate the detected escape button (if any).</p>"
+    MESSAGE = ("<p>Message boxes have a caption, a text, and up to three "
+               "buttons, each with standard or custom texts.</p>"
+               "<p>Click a button to close the message box. Pressing the Esc "
+               "button will activate the detected escape button (if any).</p>")
 
     def __init__(self, parent=None):
         super().__init__(parent)
@@ -285,7 +285,7 @@ class Dialog(QDialog):
         d, ok = QInputDialog.getDouble(self, "QInputDialog.getDouble()",
                 "Amount:", 37.56, -10000, 10000, 2)
         if ok:
-            self._double_label.setText("$%g" % d)
+            self._double_label.setText(f"${d:g}")
 
     def set_item(self):
         items = ("Spring", "Summer", "Fall", "Winter")
diff --git a/examples/widgets/gallery/widgetgallery.py b/examples/widgets/gallery/widgetgallery.py
index 0693750ac..bd7f8ce6b 100644
--- a/examples/widgets/gallery/widgetgallery.py
+++ b/examples/widgets/gallery/widgetgallery.py
@@ -305,7 +305,7 @@ class WidgetGallery(QDialog):
         # Create centered/italic HTML rich text
         rich_text = "<html><head/><body><i>"
         for line in POEM.split('\n'):
-            rich_text += "<center>" + line + "</center>"
+            rich_text += f"<center>{line}</center>"
         rich_text += "</i></body></html>"
 
         text_edit = QTextEdit(rich_text)
diff --git a/examples/widgets/graphicsview/diagramscene/diagramscene.py b/examples/widgets/graphicsview/diagramscene/diagramscene.py
index 7588c50a0..b068a8253 100644
--- a/examples/widgets/graphicsview/diagramscene/diagramscene.py
+++ b/examples/widgets/graphicsview/diagramscene/diagramscene.py
@@ -367,10 +367,10 @@ class DiagramScene(QGraphicsScene):
             self.removeItem(self.line)
             self.line = None
 
-            if len(start_items) and len(end_items) and \
-                    isinstance(start_items[0], DiagramItem) and \
-                    isinstance(end_items[0], DiagramItem) and \
-                    start_items[0] != end_items[0]:
+            if (len(start_items) and len(end_items) and
+                    isinstance(start_items[0], DiagramItem) and
+                    isinstance(end_items[0], DiagramItem) and
+                    start_items[0] != end_items[0]):
                 start_item = start_items[0]
                 end_item = end_items[0]
                 arrow = Arrow(start_item, end_item)
diff --git a/examples/widgets/graphicsview/dragdroprobot/dragdroprobot.py b/examples/widgets/graphicsview/dragdroprobot/dragdroprobot.py
index 8732c1c67..4f074aa19 100644
--- a/examples/widgets/graphicsview/dragdroprobot/dragdroprobot.py
+++ b/examples/widgets/graphicsview/dragdroprobot/dragdroprobot.py
@@ -142,8 +142,8 @@ class RobotPart(QGraphicsItem):
         self.setAcceptDrops(True)
 
     def dragEnterEvent(self, event):
-        if event.mimeData().hasColor() or \
-          (isinstance(self, RobotHead) and event.mimeData().hasImage()):
+        if (event.mimeData().hasColor() or
+                (isinstance(self, RobotHead) and event.mimeData().hasImage())):
             event.setAccepted(True)
             self._drag_over = True
             self.update()
diff --git a/examples/widgets/itemviews/addressbook/adddialogwidget.py b/examples/widgets/itemviews/addressbook/adddialogwidget.py
index eb848c4d6..1462711a8 100644
--- a/examples/widgets/itemviews/addressbook/adddialogwidget.py
+++ b/examples/widgets/itemviews/addressbook/adddialogwidget.py
@@ -99,5 +99,5 @@ if __name__ == "__main__":
     if (dialog.exec()):
         name = dialog.name
         address = dialog.address
-        print("Name:" + name)
-        print("Address:" + address)
+        print(f"Name: {name}")
+        print(f"Address: {address}")
diff --git a/examples/widgets/itemviews/addressbook/newaddresstab.py b/examples/widgets/itemviews/addressbook/newaddresstab.py
index 63ccbcc30..407c48aec 100644
--- a/examples/widgets/itemviews/addressbook/newaddresstab.py
+++ b/examples/widgets/itemviews/addressbook/newaddresstab.py
@@ -81,8 +81,8 @@ class NewAddressTab(QWidget):
 if __name__ == "__main__":
 
     def print_address(name, address):
-        print("Name:" + name)
-        print("Address:" + address)
+        print(f"Name: {name}")
+        print(f"Address: {address}")
 
     import sys
     from PySide6.QtWidgets import QApplication
diff --git a/examples/widgets/itemviews/jsonmodel/jsonmodel.py b/examples/widgets/itemviews/jsonmodel/jsonmodel.py
index 5fa324a03..432bc4b33 100644
--- a/examples/widgets/itemviews/jsonmodel/jsonmodel.py
+++ b/examples/widgets/itemviews/jsonmodel/jsonmodel.py
@@ -170,7 +170,7 @@ class JsonModel(QAbstractItemModel):
 
         assert isinstance(
             document, (dict, list, tuple)
-        ), "`document` must be of dict, list or tuple, " "not %s" % type(document)
+        ), "`document` must be of dict, list or tuple, " f"not {type(document)}"
 
         self.beginResetModel()
 
diff --git a/examples/widgets/layouts/dynamiclayouts/dynamiclayouts.py b/examples/widgets/layouts/dynamiclayouts/dynamiclayouts.py
index 994a6fb45..c0e3266ce 100644
--- a/examples/widgets/layouts/dynamiclayouts/dynamiclayouts.py
+++ b/examples/widgets/layouts/dynamiclayouts/dynamiclayouts.py
@@ -124,8 +124,8 @@ class Dialog(QDialog):
         self._rotable_widgets.append(QProgressBar())
         count = len(self._rotable_widgets)
         for i in range(count):
-            self._rotable_widgets[i].valueChanged[int].\
-                connect(self._rotable_widgets[(i + 1) % count].setValue)
+            element = self._rotable_widgets[(i + 1) % count]
+            self._rotable_widgets[i].valueChanged[int].connect(element.setValue)
 
         self._rotable_layout = QGridLayout()
         self._rotable_group_box.setLayout(self._rotable_layout)
diff --git a/examples/widgets/mainwindows/mdi/mdi.py b/examples/widgets/mainwindows/mdi/mdi.py
index 29ee71204..c674ab783 100644
--- a/examples/widgets/mainwindows/mdi/mdi.py
+++ b/examples/widgets/mainwindows/mdi/mdi.py
@@ -68,7 +68,7 @@ class MdiChild(QTextEdit):
         self._is_untitled = True
         self._cur_file = f"document{MdiChild.sequence_number}.txt"
         MdiChild.sequence_number += 1
-        self.setWindowTitle(self._cur_file + '[*]')
+        self.setWindowTitle(f"{self._cur_file}[*]")
 
         self.document().contentsChanged.connect(self.document_was_modified)
 
@@ -161,7 +161,7 @@ class MdiChild(QTextEdit):
         self._is_untitled = False
         self.document().setModified(False)
         self.setWindowModified(False)
-        self.setWindowTitle(self.user_friendly_current_file() + "[*]")
+        self.setWindowTitle(f"{self.user_friendly_current_file()}[*]")
 
     def stripped_name(self, fullFileName):
         return QFileInfo(fullFileName).fileName()
diff --git a/examples/widgets/painting/basicdrawing/basicdrawing.py b/examples/widgets/painting/basicdrawing/basicdrawing.py
index 941fe4256..d7849b0cc 100644
--- a/examples/widgets/painting/basicdrawing/basicdrawing.py
+++ b/examples/widgets/painting/basicdrawing/basicdrawing.py
@@ -59,8 +59,8 @@ class RenderArea(QWidget):
         QPoint(90, 70)
     ])
 
-    Line, Points, Polyline, Polygon, Rect, RoundedRect, Ellipse, Arc, Chord, \
-            Pie, Path, Text, Pixmap = range(13)
+    (Line, Points, Polyline, Polygon, Rect, RoundedRect, Ellipse,
+     Arc, Chord, Pie, Path, Text, Pixmap) = range(13)
 
     def __init__(self, parent=None):
         super().__init__(parent)
diff --git a/examples/widgets/state-machine/rogue/rogue.py b/examples/widgets/state-machine/rogue/rogue.py
index acf213ae6..1234bea0b 100644
--- a/examples/widgets/state-machine/rogue/rogue.py
+++ b/examples/widgets/state-machine/rogue/rogue.py
@@ -53,11 +53,11 @@ class MovementTransition(QEventTransition):
         self.window = window
 
     def eventTest(self, event):
-        if event.type() == QEvent.StateMachineWrapped and \
-          event.event().type() == QEvent.KeyPress:
+        if (event.type() == QEvent.StateMachineWrapped and
+                event.event().type() == QEvent.KeyPress):
             key = event.event().key()
-            return key == Qt.Key_2 or key == Qt.Key_8 or \
-                key == Qt.Key_6 or key == Qt.Key_4
+            return (key == Qt.Key_2 or key == Qt.Key_8 or
+                    key == Qt.Key_6 or key == Qt.Key_4)
         return False
 
     def onTransition(self, event):
@@ -109,8 +109,8 @@ class MainWindow(QMainWindow):
         for x in range(self.width):
             column = []
             for y in range(self.height):
-                if x == 0 or x == self.width - 1 or y == 0 or \
-                  y == self.height - 1 or generator.bounded(0, 40) == 0:
+                if (x == 0 or x == self.width - 1 or y == 0 or
+                        y == self.height - 1 or generator.bounded(0, 40) == 0):
                     column.append('#')
                 else:
                     column.append('.')