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PyQt5: Creation of Windows with Classes [duplicate]

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I have a PyQt5 application built that looks like so (I know I have a lot of imports, I am learning so I want complete freedom at the moment):

import sys
from PyQt5.QtGui import *
from PyQt5.QWidgets import *
from PyQt5.QtCore import *

class Menu(QMainWindow):

def __init__(self)
super().__init__()

#create bar
bar = self.menuBar()

#create bar menus
file = bar.addMenu("File")
about = bar.addMenu("About")

#create actions
quit_action = QAction("&Quit", self)
quit_action.setShortcut('Ctrl+Q')
about_action = QAction("&About...", self)

#add actions
file.addAction(quit_action)
about.addAction(about_action)

#what to do with actions
quit_action.triggered.connect(self.quit_func)
about_action.triggered.connect(self.about_func)

#window properties
self.setWindowTitle("Hello World")
self.resize(600, 400)

self.show()

def quit_func(self):
sys.exit()

def about_func(self):
pass

class About(QWidget):

def __init__(self):
super().__init__(parent)

#widgets
self.l1 = QLabel('Hello World')
self.l1.setAlignment(Qt.AlignCenter)
self.l2 = QLabel('Description of the Application')
self.l2.setAlignment(Qt.AlignCenter)

#horiz box
h_box = QHBoxLayout()
h_box.addStretch()
h_box.addWidget(self.l2)
h_box.addStretch()

#vert box
v_box = QVBoxLayout()
v_box.addWidget(self.l1)
v_box.addLayout(h_box)
v_box.addStretch()

self.setLayout(v_box)

#window properties
self.setWindowTitle("About Hello World")
self.setFixedSize(250,150)

self.show()

if not QApplication.instance()
app = QApplication(sys.argv)
else:
app = QApplication.instance()

main = Menu()
main.show()

sys.exit(app.exec())


I want the about_func() function to call to the About() class, so I can open a window separate from my Main Window created by Menu() class.

This code is throwing the error:

TypeError: QMainWindow(parent: QWidget = None, flags: Union[Qt.WindowFlags, Qt.WindowType] = Qt.WindowFlags()): argument 1 has unexpected type 'sip.wrappertype'


in reference to the super().__init__() in line 9.

super().__init__()

How could I implement this in a working fashion? Feel free to criticize any aspect of my code.

(Edited to clarify question)

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1 Answer
1

From your code it's not very clear if you are using Python 2 or 3, anyway, the basic syntax of super is:

super(yourClass, instance).method(args)


So, in your case they are both wrong :-) The first one should be:

class Menu(QMainWindow):
def __init__(self, parent=None):
super(Menu, self).__init__(parent)


Also, from Python3 the arguments of super() can be omitted, so the second example could be:

class About(QWidget):
def __init__(self, parent=None):
super().__init__(parent)


Read carefully the Built-in Functions. I know it's a long page, but it contains some of the fundamentals of Python, and studying/understanding them is almost mandatory.

TypeError: QMainWindow(parent: QWidget = None, flags: Union[Qt.WindowFlags, Qt.WindowType] = Qt.WindowFlags()): argument 1 has unexpected type 'sip.wrappertype'