How to use Qt Creator with Python?
It completely discuss Qt dev using C++, PyQt and PySide Question: I’m working on a project that requires C++ to call a program written in Python that relies on Python exclusive modules. Is it possible to write Qt application in Python utilizing Qt-Creator as IDE? Solution 1: Just desing your interface in Qt-Designer and convert it to python file executing pyuic4 .
How to use Qt Creator with Python?
I want to use Qt for developing Ubuntu desktop, phone and tablet applications but I don’t want to learn a new programming language (C++, JavaScript). Is it possible to write Qt application in Python utilizing Qt-Creator as IDE?
Just desing your interface in Qt-Designer and convert it to python file executing pyuic4 .
pyuic4 editorFrame.ui -o editorFrame.py then you can import it from your main class, in this case i’m using a QMainWindow:
import sys from PyQt4 import QtGui from editorFrame import Ui_MainWindow class Editor(QtGui.QMainWindow): def __init__(self): super(Editor, self).__init__() self.ui=Ui_MainWindow() self.ui.setupUi(self) self.show() def main(): app = QtGui.QApplication(sys.argv) ex = Editor() sys.exit(app.exec_()) if __name__ == '__main__': main() Yes, Qt-Creator is a C++ IDE, with little support for other languages but since version 2.8.0 a quite basic python support has been added.
That said you can use Qt-Designer (the form building tool), Qt-Translator (the translate tool), etc. easily with python.
There are two Qt-Python bindings right now, the GPL/Commercial dual licensed PyQt, and the LGPL PySide. I have used PyQt for a long time and I’m a happy user, I also have tried PySide but it looks less mature to me. If your license requirements allow you I’d go for PyQt.
With the release of QT Creator 2.8 things are changing. It now natively supports Python for code editing and there are few Python-based features.
From Qt Creator 2.8 release announcement:
An editor specific for Python was added, with highlighting and indentation, and a Python class wizard
You may want to follow this tutorial series though : Developing Cross Platform Application using Qt, PyQt and PySide : GUI Application Development — Part 5 of 5. It completely discuss Qt dev using C++, PyQt and PySide
Starting to use QT creator with an existing python class, I am trying to learn how to use QT creator with Python and have been using various resources mainly RealPython and a book from Packt. They are good resources but am trying to solve a particular pro
Getting started with Qt for Python
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PYTHON and QT QUICK — Power Of Qt Quick And Start
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PyQt5 Tutorial — How to Use Qt Designer
This pyqt5 tutorial will show you how to use Qt Designer with python . The first steps to using QtDesigner is to download and install pyqt5-tools (this can be
Embedding Python in a Qt Creator project
I’m working on a project that requires C++ to call a program written in Python that relies on Python exclusive modules.
The project is handled using Qt Creator, and Python 3.7.5 and its packages are installed via Miniconda. I’ve gotten a basic embedding working using Pybind11 where basic interfacing works, however, most external modules cannot be imported.
For example, when importing Numpy through Pybind11, the following error is thrown (reduced for brevity):
Importing the numpy c-extensions failed. Original error was: /home/brentnallt/miniconda3/envs/car_class_nogpu/lib/python3.7/site-packages/numpy/core/_multiarray_umath.cpython-37m-x86_64-linux-gnu.so: undefined symbol: PyMemoryView_FromObject A similar error occurs when importing tensorflow through Pybind11:
ImportError: /home/brentnallt/miniconda3/envs/car_class_nogpu/lib/python3.7/lib-dynload/_ctypes.cpython-37m-x86_64-linux-gnu.so: undefined symbol: PyUnicode_FromFormat It appears to be a problem with Python’s C API being found when reading C extension shared libraries. However, modules like lxml which use C source files import just fine. Additionally, I can import problem modules in projects separate from the project I’m working on, implying it’s a setup problem. Note that this test project setup doesn’t actually use any QT functionality, whereas the main one does.
My PYTHONHOME environment variable looks like:
['/home/brentnallt/miniconda3/envs/car_class_nogpu/lib/python3.7', '/home/brentnallt/miniconda3/envs/car_class_nogpu/lib/python3.7/site-packages', '/home/brentnallt/miniconda3/envs/car_class_nogpu/lib/python37.zip', '/home/brentnallt/miniconda3/envs/car_class_nogpu/lib/python3.7/lib-dynload', '.'] Are there any special considerations I have to make when embedding with Qt Creator? Or is this likely a different problem from a setup error?
Maybe you can consider using PythonQt as an alternative module for calling and importing python libraries from Qt application.
I’ve used it a lot in my projects and it never failed, but never used it with any kinda data scientific modules maybe you could give it a chance
How to use Qt Creator with Python?, With the release of Qt Creator 2.8 things are changing. It now natively supports Python for code editing and there are few Python-based features. From Qt Creator 2.8 release announcement: An editor specific for Python was added, with highlighting and indentation, and a Python class wizard
PyQT with QT Creator
I am trying to develop a small gui using PySide and the QT Creator. As the base implementation, I have choosen a QMainWindow . The problem is that adding any elements to that MainWindow inside the Editor results in an empty window when I run the code.
The initially generated python code looks like this:
class MainWindow(QMainWindow): def __init__(self): super(MainWindow, self).__init__() self.load_ui() def load_ui(self): loader = QUiLoader() path = os.path.join(os.path.dirname(__file__), "form.ui") ui_file = QFile(path) ui_file.open(QFile.ReadOnly) loader.load(ui_file, self) ui_file.close() if __name__ == "__main__": app = QApplication([]) widget = MainWindow() widget.show() sys.exit(app.exec_()) I know that loader.load(ui_file, self) returns a widget. My solution was:
def load_ui(self): loader = QUiLoader() path = os.path.join(os.path.dirname(__file__), "form.ui") ui_file = QFile(path) ui_file.open(QFile.ReadOnly) self.window = loader.load(ui_file, self) self.window.show() ui_file.close() if __name__ == "__main__": app = QApplication([]) widget = MainWindow() #widget.show() This works for me but this clearly cannot be the way this is supposed to work. I am confused on why QT Creator gives me this non-working templaet.
Furthermore I am curious on how custom functions should be implemented. When clicking on the clicked() slot for a button, it tells me
No ui_form.h found! (translated) I ended up writing the functions into my MainWindow class like this:
self.window.menuopen_button.clicked.connect(lambda x: self.menu_animation(x)) self.window.minimise_button.clicked.connect(lambda x: self.menu_buttons('minimise')) Your initial code only loads the UI file into the QUiLoader object - you don't do anything else with it. When you call widget.show() , you're calling the QMainWindow's show method which is a default window (and, hence, empty) since you haven't added the loaded widget to it.
Your solution similarly loads the UI but displays it via the widget object's show method. However, you're not amending it to your main window, so you're basically tossing your main window and just using the widget.
There are a couple ways to correctly accomplish what you want:
- One way would be to, as @musicamante suggested, add the loaded UI widget to your MainWindow object (and by the way, this is supported by PySide2: https://doc.qt.io/archives/qtforpython-5.12/PySide2/QtUiTools/QUiLoader.html - the example in the detailed description shows exactly how to do this).
- Or the other way, which I prefer, would be to use the uic utility, PySide2-uic, in the build process to generate a UI Python class based on the UI file.
The Qt documentation has tutorials showing both methods. The linked documentation shows pyside6 as support for PySide2 has been discontinued with the release of Qt6. The API for PySide2, PySide6, and PyQt5 are all very similar, so if you're migrating from either PySide2 or PyQt then the change should be relatively painless. I recommend using PySide6 as this is the Python binding officially supported by Qt.
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Calling a Python Script using C++ in QT Creator
I have a Python script that takes three folders as input. I am trying to create a GUI in which I browse for the three folder locations, then call the Python script with those as parameters. I've already create the GUI and can browse for the folder locations, but I seem to have problems calling the Python script using either QProcess or Python.h.
QString arg1 = ui->folder1->text(); QString arg2 = ui->folder2->text(); QString arg3 = ui->folder3->text(); QProcess p; QString script = "python script.py"; QStringList params; params displayOutput->setText(p_stdout); QString arg1 = ui->folder1->text(); QString arg2 = ui->folder2->text(); QString arg3 = ui->folder3->text(); const char* args1 = arg1.toUtf8().constData(); const char* args2 = arg2.toUtf8().constData(); const char* args3 = arg3.toUtf8().constData(); PyObject *pName, *pModule, *pDict, *pFunc, *pValue, *pResult, *pArgs; // Initialize Python Interpreter Py_Initialize(); // Convert python script's name into Python string pName = PyString_FromString("script"); // Import the file as a Python module pModule = PyImport_Import(pName); // Create a dictionary for the contents of the module pDict = PyModule_GetDict(pModule); // Arguments pArgs = PyTuple_New(3); PyTuple_SetItem(pArgs, 0, PyString_FromString(args1)); PyTuple_SetItem(pArgs, 1, PyString_FromString(args2)); PyTuple_SetItem(pArgs, 2, PyString_FromString(args3)); pFunc = PyDict_GetItemString(pDict, "main"); pResult = PyObject_CallObject(pFunc, pArgs); Py_Finalize(); I will say that when I do run the Python.h in either debug or Release, the program crashes when I press the button to run the code. Is there a better way to run either code without running into issues?
Edit: It is able to run without arguments using the QProcess method, yet will not run when I include the arguments, which are folder paths. I made a function to put quotations to those folders that have whitespace in them, but it still won't run. Is there a way to pass in the folders as parameters so that the Python script can run?
So after trying different methods, this is what works for me on Windows
QString cmd_qt = QString("python %1script.py %2 %3 %4").arg(filename1).arg(filename3).arg(filename4).arg(filename5); const char* cmd = cmd_qt.toLocal8Bit().constData(); system(cmd); This just calls the Python function via command prompt. I don't know if this is the most efficient way. but it works for now. If there is a better way, let me know.
QString script = "python "+ "../folder1/script.py; const char* cmd = script.toLocal8Bit().constData(); system(cmd); is not reading the content correctly.
The output shows Invalid Test_log directory always.
But when running the python script.py from command line directly gives proper o/p. Thepython path is set in my envionment variable .
log_dir = '../Test_Logs/' if not os.path.exists(log_dir): print('Invalid Test_log directory') exit() Python - How to create a custom Qt widget using Qt, What I tried I created a widgets application on Qt Creator, built the UI with it, Then convert the ui file into a python file. That py file starts with the following code: class myCustomWidget (object): def setupUi (self, MainWindow): MainWindow.setObjectName ("MainWindow") MainWindow.resize (1024, 768) …