PyQt5, PySide6 and PyCharm issue

LMario

I am starting using PySide6. I am using the software in title. I get the following error:

I developed the UI with Qt 5 designer and then converted it to a .py file.

Traceback (most recent call last):
  File "/media/soporte/DD Externo/LMario/ITSTA/Carga Académica/AY-Feb-Jul25/Programación Visual/Prácticas Python PySide/HolaMundoEnv/HolaMundo.py", line 23, in <module>
    form = HolaMundo()
  File "/media/soporte/DD Externo/LMario/ITSTA/Carga Académica/AY-Feb-Jul25/Programación Visual/Prácticas Python PySide/HolaMundoEnv/HolaMundo.py", line 15, in __init__
    self.setupUi(self)
  File "/media/soporte/DD Externo/LMario/ITSTA/Carga Académica/AY-Feb-Jul25/Programación Visual/Prácticas Python PySide/HolaMundoEnv/HolaMundoGUI.py", line 18, in setupUi
    self.centralwidget = QtWidgets.QWidget(MainWindow)
TypeError: QWidget(parent: Optional[QWidget] = None, flags: Union[Qt.WindowFlags, Qt.WindowType] = Qt.WindowFlags()): argument 1 has unexpected type 'HolaMundo'

Process finished with exit code 1

The scripts are:

import os
import sys
if sys.platform == "linux":
    # Fixes "undefined symbol: wl_proxy_marshal_flags": https://bugreports.qt.io/browse/QTBUG-114635}}
    os.environ.setdefault("QT_QPA_PLATFORM", "xcb")

from PySide6 import QtWidgets as qtw

from HolaMundoGUI import Ui_MainWindow

class HolaMundo(qtw.QWidget, Ui_MainWindow):
  def __init__(self):
    super().__init__()

    self.setupUi(self)

    self.show()

if __name__ == "__main__":

  app = qtw.QApplication(sys.argv)

  form = HolaMundo()

  sys.exit(app.exec())

HolaMundoGUI is

# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'HolaMundoGUI.ui'
#
# Created by: PyQt5 UI code generator 5.15.9
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.horizontalLayout_2 = QtWidgets.QHBoxLayout(self.centralwidget)
        self.horizontalLayout_2.setObjectName("horizontalLayout_2")
        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setMaximumSize(QtCore.QSize(100, 30))
        self.pushButton.setObjectName("pushButton")
        self.horizontalLayout.addWidget(self.pushButton)
        self.horizontalLayout_2.addLayout(self.horizontalLayout)
        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "Aceptar"))

SGaist

Hi and welcome to devnet,

You HolaMundo a QWidget however from your Ui_MainWindow it's clearly a QMainWindow. You cannot just change the base class like that.

LMario

Thanks for your help, but I need more guidance.

Do I need to regenerate HolaMUndoGUI.py in another way or is the problem solved by making changes to the main program?

Thanks.

SGaist

The less error prone would be to revert that file back to it's original name and content.
There's a logic why the UI file and then the generated class share the same name.

LMario

It is not clear to me what you say since the generated class is called HolaMundo and the UI file HolaMundoGUI.

JonB

@LMario
I don't know quite what @SGaist is getting at about different names/content. However above all your first file has

from PySide6 import QtWidgets as qtw

while your second file has

from PyQt5 import QtCore, QtGui, QtWidgets

What is going on here? Per your title you certainly cannot mix either PyQt and PySide nor anything Qt5 with Qt6.

SGaist

@JonB Good catch !

As for what I meant: the uic file is clearly for a class named MainWindow and not HolaMundo.