Examples: Fix a number of flake8 errors (part 1)

First batch, including low-hanging fruit like Alignments, whitespaces,
line length, indents, etc.

Pick-to: 6.6
Change-Id: I55966876077f7fddfdc82cbe376677af9995f329
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

9 files changed, 74 insertions, 81 deletions

diff --git a/examples/widgets/tutorials/addressbook/part2.py b/examples/widgets/tutorials/addressbook/part2.py
index 89c813006..3c0eb451d 100644
--- a/examples/widgets/tutorials/addressbook/part2.py
+++ b/examples/widgets/tutorials/addressbook/part2.py
@@ -102,17 +102,16 @@ class AddressBook(QWidget):
         address = self._address_text.toPlainText()
 
         if name == "" or address == "":
-            QMessageBox.information(self, "Empty Field",
-                    "Please enter a name and address.")
+            QMessageBox.information(self, "Empty Field", "Please enter a name and address.")
             return
 
         if name not in self.contacts:
             self.contacts[name] = address
             QMessageBox.information(self, "Add Successful",
-                    f'"{name}" has been added to your address book.')
+                                    f'"{name}" has been added to your address book.')
         else:
             QMessageBox.information(self, "Add Unsuccessful",
-                    f'Sorry, "{name}" is already in your address book.')
+                                    f'Sorry, "{name}" is already in your address book.')
             return
 
         if not self.contacts:
diff --git a/examples/widgets/tutorials/addressbook/part3.py b/examples/widgets/tutorials/addressbook/part3.py
index 571a96a48..611796f5e 100644
--- a/examples/widgets/tutorials/addressbook/part3.py
+++ b/examples/widgets/tutorials/addressbook/part3.py
@@ -116,17 +116,16 @@ class AddressBook(QWidget):
         address = self._address_text.toPlainText()
 
         if name == "" or address == "":
-            QMessageBox.information(self, "Empty Field",
-                    "Please enter a name and address.")
+            QMessageBox.information(self, "Empty Field", "Please enter a name and address.")
             return
 
         if name not in self.contacts:
             self.contacts[name] = address
             QMessageBox.information(self, "Add Successful",
-                    f'"{name}" has been added to your address book.')
+                                    f'"{name}" has been added to your address book.')
         else:
             QMessageBox.information(self, "Add Unsuccessful",
-                    f'Sorry, "{name}" is already in your address book.')
+                                    f'Sorry, "{name}" is already in your address book.')
             return
 
         if not self.contacts:
diff --git a/examples/widgets/tutorials/addressbook/part4.py b/examples/widgets/tutorials/addressbook/part4.py
index 505fe4db9..535e3929f 100644
--- a/examples/widgets/tutorials/addressbook/part4.py
+++ b/examples/widgets/tutorials/addressbook/part4.py
@@ -128,34 +128,34 @@ class AddressBook(QWidget):
         address = self._address_text.toPlainText()
 
         if name == "" or address == "":
-            QMessageBox.information(self, "Empty Field",
-                    "Please enter a name and address.")
+            QMessageBox.information(self, "Empty Field", "Please enter a name and address.")
             return
 
         if self._current_mode == self.AddingMode:
             if name not in self.contacts:
                 self.contacts[name] = address
                 QMessageBox.information(self, "Add Successful",
-                        f'"{name}" has been added to your address book.')
+                                        f'"{name}" has been added to your address book.')
             else:
                 QMessageBox.information(self, "Add Unsuccessful",
-                        f'Sorry, "{name}" is already in your address book.')
+                                        f'Sorry, "{name}" is already in your address book.')
                 return
 
         elif self._current_mode == self.EditingMode:
             if self._old_name != name:
                 if name not in self.contacts:
                     QMessageBox.information(self, "Edit Successful",
-                            f'"{self.oldName}" has been edited in your address book.')
+                                            f'"{self.oldName}" has been edited in your '
+                                            'address book.')
                     del self.contacts[self._old_name]
                     self.contacts[name] = address
                 else:
                     QMessageBox.information(self, "Edit Unsuccessful",
-                            f'Sorry, "{name}" is already in your address book.')
+                                            f'Sorry, "{name}" is already in your address book.')
                     return
             elif self._old_address != address:
                 QMessageBox.information(self, "Edit Successful",
-                        f'"{name}" has been edited in your address book.')
+                                        f'"{name}" has been edited in your address book.')
                 self.contacts[name] = address
 
         self.update_interface(self.NavigationMode)
@@ -173,15 +173,15 @@ class AddressBook(QWidget):
 
         if name in self.contacts:
             button = QMessageBox.question(self, "Confirm Remove",
-                    f'Are you sure you want to remove "{name}"?',
-                    QMessageBox.Yes | QMessageBox.No)
+                                          f'Are you sure you want to remove "{name}"?',
+                                          QMessageBox.Yes | QMessageBox.No)
 
             if button == QMessageBox.Yes:
                 self.previous()
                 del self.contacts[name]
 
                 QMessageBox.information(self, "Remove Successful",
-                        f'"{name}" has been removed from your address book.')
+                                        f'"{name}" has been removed from your address book.')
 
         self.update_interface(self.NavigationMode)
 
diff --git a/examples/widgets/tutorials/addressbook/part5.py b/examples/widgets/tutorials/addressbook/part5.py
index 72245703f..921c210d4 100644
--- a/examples/widgets/tutorials/addressbook/part5.py
+++ b/examples/widgets/tutorials/addressbook/part5.py
@@ -134,34 +134,34 @@ class AddressBook(QWidget):
         address = self._address_text.toPlainText()
 
         if name == "" or address == "":
-            QMessageBox.information(self, "Empty Field",
-                    "Please enter a name and address.")
+            QMessageBox.information(self, "Empty Field", "Please enter a name and address.")
             return
 
         if self._current_mode == self.AddingMode:
             if name not in self.contacts:
                 self.contacts[name] = address
                 QMessageBox.information(self, "Add Successful",
-                        f'"{name}" has been added to your address book.')
+                                        f'"{name}" has been added to your address book.')
             else:
                 QMessageBox.information(self, "Add Unsuccessful",
-                        f'Sorry, "{name}" is already in your address book.')
+                                        f'Sorry, "{name}" is already in your address book.')
                 return
 
         elif self._current_mode == self.EditingMode:
             if self._old_name != name:
                 if name not in self.contacts:
                     QMessageBox.information(self, "Edit Successful",
-                            f'"{self.oldName}" has been edited in your address book.')
+                                            f'"{self.oldName}" has been edited in your '
+                                            'address book.')
                     del self.contacts[self._old_name]
                     self.contacts[name] = address
                 else:
                     QMessageBox.information(self, "Edit Unsuccessful",
-                            f'Sorry, "{name}" is already in your address book.')
+                                            f'Sorry, "{name}" is already in your address book.')
                     return
             elif self._old_address != address:
                 QMessageBox.information(self, "Edit Successful",
-                        f'"{name}" has been edited in your address book.')
+                                        f'"{name}" has been edited in your address book.')
                 self.contacts[name] = address
 
         self.update_interface(self.NavigationMode)
@@ -179,15 +179,15 @@ class AddressBook(QWidget):
 
         if name in self.contacts:
             button = QMessageBox.question(self, "Confirm Remove",
-                    f'Are you sure you want to remove "{name}"?',
-                    QMessageBox.Yes | QMessageBox.No)
+                                          f'Are you sure you want to remove "{name}"?',
+                                          QMessageBox.Yes | QMessageBox.No)
 
             if button == QMessageBox.Yes:
                 self.previous()
                 del self.contacts[name]
 
                 QMessageBox.information(self, "Remove Successful",
-                        f'"{name}" has been removed from your address book.')
+                                        f'"{name}" has been removed from your address book.')
 
         self.update_interface(self.NavigationMode)
 
@@ -243,7 +243,7 @@ class AddressBook(QWidget):
                 self._address_text.setText(self.contacts[contact_name])
             else:
                 QMessageBox.information(self, "Contact Not Found",
-                        f'Sorry, "{contact_name}" is not in your address book.')
+                                        f'Sorry, "{contact_name}" is not in your address book.')
                 return
 
         self.update_interface(self.NavigationMode)
@@ -311,8 +311,7 @@ class FindDialog(QDialog):
         text = self._line_edit.text()
 
         if not text:
-            QMessageBox.information(self, "Empty Field",
-                    "Please enter a name.")
+            QMessageBox.information(self, "Empty Field", "Please enter a name.")
             return
         else:
             self._find_text = text
diff --git a/examples/widgets/tutorials/addressbook/part6.py b/examples/widgets/tutorials/addressbook/part6.py
index f75fbf44f..af68412b1 100644
--- a/examples/widgets/tutorials/addressbook/part6.py
+++ b/examples/widgets/tutorials/addressbook/part6.py
@@ -145,34 +145,34 @@ class AddressBook(QWidget):
         address = self._address_text.toPlainText()
 
         if name == "" or address == "":
-            QMessageBox.information(self, "Empty Field",
-                    "Please enter a name and address.")
+            QMessageBox.information(self, "Empty Field", "Please enter a name and address.")
             return
 
         if self._current_mode == self.AddingMode:
             if name not in self.contacts:
                 self.contacts[name] = address
                 QMessageBox.information(self, "Add Successful",
-                        f'"{name}" has been added to your address book.')
+                                        f'"{name}" has been added to your address book.')
             else:
                 QMessageBox.information(self, "Add Unsuccessful",
-                        f'Sorry, "{name}" is already in your address book.')
+                                        f'Sorry, "{name}" is already in your address book.')
                 return
 
         elif self._current_mode == self.EditingMode:
             if self._old_name != name:
                 if name not in self.contacts:
                     QMessageBox.information(self, "Edit Successful",
-                            f'"{self.oldName}" has been edited in your address book.')
+                                            f'"{self.oldName}" has been edited in your '
+                                            'address book.')
                     del self.contacts[self._old_name]
                     self.contacts[name] = address
                 else:
                     QMessageBox.information(self, "Edit Unsuccessful",
-                            f'Sorry, "{name}" is already in your address book.')
+                                            f'Sorry, "{name}" is already in your address book.')
                     return
             elif self._old_address != address:
                 QMessageBox.information(self, "Edit Successful",
-                        f'"{name}" has been edited in your address book.')
+                                        f'"{name}" has been edited in your address book.')
                 self.contacts[name] = address
 
         self.update_interface(self.NavigationMode)
@@ -190,15 +190,15 @@ class AddressBook(QWidget):
 
         if name in self.contacts:
             button = QMessageBox.question(self, "Confirm Remove",
-                    f'Are you sure you want to remove "{name}"?',
-                    QMessageBox.Yes | QMessageBox.No)
+                                          f'Are you sure you want to remove "{name}"?',
+                                          QMessageBox.Yes | QMessageBox.No)
 
             if button == QMessageBox.Yes:
                 self.previous()
                 del self.contacts[name]
 
                 QMessageBox.information(self, "Remove Successful",
-                        f'"{name}" has been removed from your address book.')
+                                        f'"{name}" has been removed from your address book.')
 
         self.update_interface(self.NavigationMode)
 
@@ -254,7 +254,7 @@ class AddressBook(QWidget):
                 self._address_text.setText(self.contacts[contact_name])
             else:
                 QMessageBox.information(self, "Contact Not Found",
-                        f'Sorry, "{contact_name}" is not in your address book.')
+                                        f'Sorry, "{contact_name}" is not in your address book.')
                 return
 
         self.update_interface(self.NavigationMode)
@@ -304,8 +304,8 @@ class AddressBook(QWidget):
 
     def save_to_file(self):
         fileName, _ = QFileDialog.getSaveFileName(self,
-                "Save Address Book", '',
-                "Address Book (*.abk);;All Files (*)")
+                                                  "Save Address Book", '',
+                                                  "Address Book (*.abk);;All Files (*)")
 
         if not fileName:
             return
@@ -314,7 +314,7 @@ class AddressBook(QWidget):
             out_file = open(str(fileName), 'wb')
         except IOError:
             QMessageBox.information(self, "Unable to open file",
-                    f'There was an error opening "{fileName}"')
+                                    f'There was an error opening "{fileName}"')
             return
 
         pickle.dump(self.contacts, out_file)
@@ -322,8 +322,8 @@ class AddressBook(QWidget):
 
     def load_from_file(self):
         fileName, _ = QFileDialog.getOpenFileName(self,
-                "Open Address Book", '',
-                "Address Book (*.abk);;All Files (*)")
+                                                  "Open Address Book", '',
+                                                  "Address Book (*.abk);;All Files (*)")
 
         if not fileName:
             return
@@ -332,7 +332,7 @@ class AddressBook(QWidget):
             in_file = open(str(fileName), 'rb')
         except IOError:
             QMessageBox.information(self, "Unable to open file",
-                    f'There was an error opening "{fileName}"')
+                                    f'There was an error opening "{fileName}"')
             return
 
         self.contacts = pickle.load(in_file)
@@ -340,8 +340,7 @@ class AddressBook(QWidget):
 
         if len(self.contacts) == 0:
             QMessageBox.information(self, "No contacts in file",
-                    "The file you are attempting to open contains no "
-                    "contacts.")
+                                    "The file you are attempting to open contains no contacts.")
         else:
             for name, address in self.contacts:
                 self._name_line.setText(name)
@@ -375,8 +374,7 @@ class FindDialog(QDialog):
         text = self._line_edit.text()
 
         if not text:
-            QMessageBox.information(self, "Empty Field",
-                    "Please enter a name.")
+            QMessageBox.information(self, "Empty Field", "Please enter a name.")
             return
 
         self._find_text = text
diff --git a/examples/widgets/tutorials/addressbook/part7.py b/examples/widgets/tutorials/addressbook/part7.py
index 2f874f9bd..35a7d1728 100644
--- a/examples/widgets/tutorials/addressbook/part7.py
+++ b/examples/widgets/tutorials/addressbook/part7.py
@@ -151,34 +151,34 @@ class AddressBook(QWidget):
         address = self._address_text.toPlainText()
 
         if name == "" or address == "":
-            QMessageBox.information(self, "Empty Field",
-                    "Please enter a name and address.")
+            QMessageBox.information(self, "Empty Field", "Please enter a name and address.")
             return
 
         if self._current_mode == self.AddingMode:
             if name not in self.contacts:
                 self.contacts[name] = address
                 QMessageBox.information(self, "Add Successful",
-                        f'"{name}" has been added to your address book.')
+                                        f'"{name}" has been added to your address book.')
             else:
                 QMessageBox.information(self, "Add Unsuccessful",
-                        f'Sorry, "{name}" is already in your address book.')
+                                        f'Sorry, "{name}" is already in your address book.')
                 return
 
         elif self._current_mode == self.EditingMode:
             if self._old_name != name:
                 if name not in self.contacts:
                     QMessageBox.information(self, "Edit Successful",
-                            f'"{self.oldName}" has been edited in your address book.')
+                                            f'"{self.oldName}" has been edited in your '
+                                            'address book.')
                     del self.contacts[self._old_name]
                     self.contacts[name] = address
                 else:
                     QMessageBox.information(self, "Edit Unsuccessful",
-                            f'Sorry, "{name}" is already in your address book.')
+                                            f'Sorry, "{name}" is already in your address book.')
                     return
             elif self._old_address != address:
                 QMessageBox.information(self, "Edit Successful",
-                        f'"{name}" has been edited in your address book.')
+                                        f'"{name}" has been edited in your address book.')
                 self.contacts[name] = address
 
         self.update_interface(self.NavigationMode)
@@ -196,15 +196,15 @@ class AddressBook(QWidget):
 
         if name in self.contacts:
             button = QMessageBox.question(self, "Confirm Remove",
-                    f'Are you sure you want to remove "{name}"?',
-                    QMessageBox.Yes | QMessageBox.No)
+                                          f'Are you sure you want to remove "{name}"?',
+                                          QMessageBox.Yes | QMessageBox.No)
 
             if button == QMessageBox.Yes:
                 self.previous()
                 del self.contacts[name]
 
                 QMessageBox.information(self, "Remove Successful",
-                        f'"{name}" has been removed from your address book.')
+                                        f'"{name}" has been removed from your address book.')
 
         self.update_interface(self.NavigationMode)
 
@@ -260,7 +260,7 @@ class AddressBook(QWidget):
                 self._address_text.setText(self.contacts[contact_name])
             else:
                 QMessageBox.information(self, "Contact Not Found",
-                        f'Sorry, "{contact_name}" is not in your address book.')
+                                        f'Sorry, "{contact_name}" is not in your address book.')
                 return
 
         self.update_interface(self.NavigationMode)
@@ -313,8 +313,8 @@ class AddressBook(QWidget):
 
     def save_to_file(self):
         fileName, _ = QFileDialog.getSaveFileName(self,
-                "Save Address Book", '',
-                "Address Book (*.abk);;All Files (*)")
+                                                  "Save Address Book", '',
+                                                  "Address Book (*.abk);;All Files (*)")
 
         if not fileName:
             return
@@ -323,7 +323,7 @@ class AddressBook(QWidget):
             out_file = open(str(fileName), 'wb')
         except IOError:
             QMessageBox.information(self, "Unable to open file",
-                    f'There was an error opening "{fileName}"')
+                                    f'There was an error opening "{fileName}"')
             return
 
         pickle.dump(self.contacts, out_file)
@@ -331,8 +331,8 @@ class AddressBook(QWidget):
 
     def load_from_file(self):
         fileName, _ = QFileDialog.getOpenFileName(self,
-                "Open Address Book", '',
-                "Address Book (*.abk);;All Files (*)")
+                                                  "Open Address Book", '',
+                                                  "Address Book (*.abk);;All Files (*)")
 
         if not fileName:
             return
@@ -341,7 +341,7 @@ class AddressBook(QWidget):
             in_file = open(str(fileName), 'rb')
         except IOError:
             QMessageBox.information(self, "Unable to open file",
-                    f'There was an error opening "{fileName}"')
+                                    f'There was an error opening "{fileName}"')
             return
 
         self.contacts = pickle.load(in_file)
@@ -349,8 +349,7 @@ class AddressBook(QWidget):
 
         if len(self.contacts) == 0:
             QMessageBox.information(self, "No contacts in file",
-                    "The file you are attempting to open contains no "
-                    "contacts.")
+                                    "The file you are attempting to open contains no contacts.")
         else:
             for name, address in self.contacts:
                 self._name_line.setText(name)
@@ -372,7 +371,7 @@ class AddressBook(QWidget):
             last_name = ''
 
         file_name = QFileDialog.getSaveFileName(self, "Export Contact",
-                '', "vCard Files (*.vcf);;All Files (*)")[0]
+                                                '', "vCard Files (*.vcf);;All Files (*)")[0]
 
         if not file_name:
             return
@@ -380,8 +379,7 @@ class AddressBook(QWidget):
         out_file = QFile(file_name)
 
         if not out_file.open(QIODevice.WriteOnly):
-            QMessageBox.information(self, "Unable to open file",
-                    out_file.errorString())
+            QMessageBox.information(self, "Unable to open file", out_file.errorString())
             return
 
         out_s = QTextStream(out_file)
@@ -399,7 +397,7 @@ class AddressBook(QWidget):
         out_s << 'END:VCARD' << '\n'
 
         QMessageBox.information(self, "Export Successful",
-                f'"{name}" has been exported as a vCard.')
+                                f'"{name}" has been exported as a vCard.')
 
 
 class FindDialog(QDialog):
@@ -427,8 +425,7 @@ class FindDialog(QDialog):
         text = self._line_edit.text()
 
         if not text:
-            QMessageBox.information(self, "Empty Field",
-                    "Please enter a name.")
+            QMessageBox.information(self, "Empty Field", "Please enter a name.")
             return
 
         self._find_text = text
diff --git a/examples/widgets/tutorials/cannon/t11.py b/examples/widgets/tutorials/cannon/t11.py
index 997eecbd1..10afea90c 100644
--- a/examples/widgets/tutorials/cannon/t11.py
+++ b/examples/widgets/tutorials/cannon/t11.py
@@ -45,8 +45,8 @@ class LCDRange(QWidget):
     def set_range(self, minValue, maxValue):
         if minValue < 0 or maxValue > 99 or minValue > maxValue:
             qWarning(f"LCDRange::setRange({minValue}, {maxValue})\n"
-                    "\tRange must be 0..99\n"
-                    "\tand minValue must not be greater than maxValue")
+                     "\tRange must be 0..99\n"
+                     "\tand minValue must not be greater than maxValue")
             return
 
         self.slider.setRange(minValue, maxValue)
diff --git a/examples/widgets/tutorials/cannon/t14.py b/examples/widgets/tutorials/cannon/t14.py
index 5e74443ed..88babe9ea 100644
--- a/examples/widgets/tutorials/cannon/t14.py
+++ b/examples/widgets/tutorials/cannon/t14.py
@@ -174,7 +174,8 @@ class CannonField(QWidget):
             self._auto_shoot_timer.stop()
             self.hit.emit()
             self.can_shoot.emit(True)
-        elif shot_r.x() > self.width() or shot_r.y() > self.height() or shot_r.intersects(self.barrier_rect()):
+        elif (shot_r.x() > self.width() or shot_r.y() > self.height()
+                or shot_r.intersects(self.barrier_rect())):
             self._auto_shoot_timer.stop()
             self.missed.emit()
             self.can_shoot.emit(True)
diff --git a/examples/widgets/tutorials/modelview/2_formatting.py b/examples/widgets/tutorials/modelview/2_formatting.py
index 73c993e5f..f39ec462c 100644
--- a/examples/widgets/tutorials/modelview/2_formatting.py
+++ b/examples/widgets/tutorials/modelview/2_formatting.py
@@ -32,7 +32,7 @@ class MyModel(QAbstractTableModel):
                 return "<--left"
             if row == 1 and col == 1:
                 return "right-->"
-            return f"Row{row}, Column{col+1}"
+            return f"Row{row}, Column{col + 1}"
 
         elif role == Qt.FontRole:
             if row == 0 and col == 0:  # change font only for cell(0,0)