Hi,
When I tried running Qt Designer on macOs, it gives error saying
macOS cannot verify that this app is free from malware.

This item is on the disk image “Qt Designer.dmg”. Safari downloaded this disk image today at 2:25 pm from build-system.fman.io.

.

At least on my linux PyQt6 it just does not run.
instead of QPalette need QPalette.ColorRole
qt.white does not work I settled on QColorConstants.White
QColorConstants.Red etc.
I added QColorConstants, QAction, QKeySequence to the
from PyQt6.QtGui import

Using Windows 10, I get the following warning:

I can not seem to find any information about how to install it locally.

I'm coming from the Book "Python and Qt - The Best Parts". I don't know if this is the right spot for this issue, but it is mainly about the book.

This book uses the examples in this repo. There's one example how to use QML with PyQt. Then later on fbs is being added to the stack. Now I wanted to combine both but fell on my nose doing so.

If you use QML like in the example and add fbs to it, the frozen app won't do anything. It starts a UI process but doesn't open a window. In that situation you have to kill that process, or you can't freeze the project again, because the .exe is still running in the background. By fiddling around I found what the problem is:

The frozen app has no copy of the .qml file. So, it can't load it. You need to move it into the src/main/resources/base folder and load it like so:

engine = QQmlApplicationEngine()
engine.load(app_context.get_resource('window.qml'))

Freezing the project like this makes the frozen executable run as expected.

Yes, you can combine the information from the book to come to this solution. But I think it should be mentioned explicitly that you have to use .get_resource() for .qml files, too.

I made a video course for Packt on Reactive programming with Python and it included a bunch of code for using PyQt5 as well:

• simple hello world
• desktop client for a simple stock exchange:
  • using QTableWidget
  • using QGridLayout
  • using QFormLayout
  • using the textChanged callback with QLineEdit

The example is a bit bigger than just showcasing one widget, it would be nice to include a link to https://github.com/rudolfolah/Reactive-Programming-in-Python/blob/master/Section%206/client/

Alternatively, I could create a PR that simplifies that example further but still gives devs an opportunity to see an example of using multiple PyQt widgets with multiple windows/forms/layouts.

Should maybe be mentioned in the README.

See: https://stackoverflow.com/questions/44274151/pyside2-on-windows

(venv) C:\Users\X\Documents\Python Scripts\pyside>pip install PySide2
ERROR: Could not find a version that satisfies the requirement PySide2 (from versions: none)
ERROR: No matching distribution found for PySide2

Followed the instructions, the first example works. Trying the 06 QML Python example returns an error.

(venv) C:\Users\X\Documents\Python Scripts\qtexamples\src\01 PyQt QLabel>cd "C:\Users\User\Documents\Python Scripts\qtexamples\src\06 QML Python example"

(venv) C:\Users\X\Documents\Python Scripts\qtexamples\src\06 QML Python example>python main.py
QQmlApplicationEngine failed to load component
file:///C:/Users/X/Documents/Python Scripts/qtexamples/src/06 QML Python example/main.qml:1 plugin cannot be loaded for module "QtQuick": Cannot load library C:\Users\X\Documents\Python Scripts\qtexamples\venv\lib\site-packages\PyQt5\Qt\qml\QtQuick.2\qtquick2plugin.dll: The specified procedure could not be found.

I am making a software and gonna distribute it (for free),so still I need to buy a licence from riverbank?

In this demo :

If I raise Exception or print , I can't get anything output, and Custom Plugin not show in QtDesigner :

So , How do I debug My plugin?

In Pyqt6 QAction was moved to QtGui, QKeySequence requires the StandardKey addition

from PyQt6.QtWidgets import *
from PyQt6.QtGui import QKeySequence, QAction

class MainWindow(QMainWindow):
    def closeEvent(self, e):
        if not text.document().isModified():
            return
        answer = QMessageBox.question(
            window, None,
            "You have unsaved changes. Save before closing?",
            QMessageBox.Save | QMessageBox.Discard | QMessageBox.Cancel
        )
        if answer & QMessageBox.Save:
            save()
            if text.document().isModified():
            	# This happens when the user closes the Save As... dialog.
            	# We do not want to close the window in this case because it
            	# would throw away unsaved changes.
                e.ignore()
                
        elif answer & QMessageBox.Cancel:
            e.ignore()

app = QApplication([])
app.setApplicationName("Text Editor")
text = QPlainTextEdit()
window = MainWindow()
window.setCentralWidget(text)

file_path = None

menu = window.menuBar().addMenu("&File")
open_action = QAction("&Open")
def open_file():
    global file_path
    path = QFileDialog.getOpenFileName(window, "Open")[0]
    if path:
        text.setPlainText(open(path).read())
        file_path = path
open_action.triggered.connect(open_file)
open_action.setShortcut(QKeySequence.StandardKey.Open)
menu.addAction(open_action)

save_action = QAction("&Save")
def save():
    if file_path is None:
        save_as()
    else:
        with open(file_path, "w") as f:
            f.write(text.toPlainText())
        text.document().setModified(False)
save_action.triggered.connect(save)
save_action.setShortcut(QKeySequence.StandardKey.Save)
menu.addAction(save_action)

save_as_action = QAction("Save &As...")
def save_as():
    global file_path
    path = QFileDialog.getSaveFileName(window, "Save As")[0]
    if path:
        file_path = path
        save()
save_as_action.triggered.connect(save_as)
menu.addAction(save_as_action)

close = QAction("&Close")
close.triggered.connect(window.close)
menu.addAction(close)

help_menu = window.menuBar().addMenu("&Help")
about_action = QAction("&About")
help_menu.addAction(about_action)
def show_about_dialog():
    text = "<center>" \
           "<h1>Text Editor</h1>" \
           "&#8291;" \
           "<img src=icon.svg>" \
           "</center>" \
           "<p>Version 31.4.159.265358<br/>" \
           "Copyright &copy; Company Inc.</p>"
    QMessageBox.about(window, "About Text Editor", text)
about_action.triggered.connect(show_about_dialog)

window.show()
app.exec()