Pfthb

I know this question have been asked multiple times. But I can't understand with the existing examples.
I have a code which creates a window with a button called 'start'. I want the app to close the current window and open a new window when the 'start' button is clicked. The new window has to be a blank window.

Any help is much appreciated.

The code is as follows:

import sys
from PyQt5 import QtGui
from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton, 
 QToolTip, QMessageBox, QLabel


class Window(QMainWindow):
 def __init__(self):
 super().__init__()

 self.title = "First Window"
 self.top = 100
 self.left = 100
 self.width = 680
 self.height = 500

 self.pushButton = QPushButton("Start", self)
 self.pushButton.move(275, 200)
 self.pushButton.setToolTip("<h3>Start the Session</h3>")
 self.main_window()

 def main_window(self):
 self.label = QLabel("Manager", self)
 self.label.move(285, 175)
 self.setWindowTitle(self.title)
 self.setGeometry(self.top, self.left, self.width, self.height)
 self.show()


if __name__ == "__main__":
 app = QApplication(sys.argv)
 window = Window()
 sys.exit(app.exec())

Try it:

import sys
from PyQt5 import QtGui
from PyQt5.QtWidgets import (QApplication, QMainWindow, QPushButton, 
 QToolTip, QMessageBox, QLabel)

class Window2(QMainWindow): # <===
 def __init__(self):
 super().__init__()
 self.setWindowTitle("Window22222")

class Window(QMainWindow):
 def __init__(self):
 super().__init__()

 self.title = "First Window"
 self.top = 100
 self.left = 100
 self.width = 680
 self.height = 500

 self.pushButton = QPushButton("Start", self)
 self.pushButton.move(275, 200)
 self.pushButton.setToolTip("<h3>Start the Session</h3>")

 self.pushButton.clicked.connect(self.window2) # <===

 self.main_window()

 def main_window(self):
 self.label = QLabel("Manager", self)
 self.label.move(285, 175)
 self.setWindowTitle(self.title)
 self.setGeometry(self.top, self.left, self.width, self.height)
 self.show()

 def window2(self): # <===
 self.w = Window2()
 self.w.show()
 self.hide()

if __name__ == "__main__":
 app = QApplication(sys.argv)
 window = Window()
 sys.exit(app.exec())