Calling a Window upon pressing of a Button in PyQt6

This demo program shows how to call window upon pressing a button, add tool tip to button and format the tool tip text using html.

The output:

The code:

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import sys from PyQt6 import QtGui from PyQt6.QtWidgets import QApplication, QMainWindow, QPushButton, QToolTip, QMessageBox, QLabel class Window2(QMainWindow): # <=== def __init__(self): super().__init__() self.setWindowTitle("Welcome!!!") self.top = 200 self.left = 200 self.width = 300 self.height = 350 self.setGeometry(self.top, self.left, self.width, self.height) self.pushButton = QPushButton("Logout", self) self.pushButton.move(100, 75) self.pushButton.setToolTip("<h4>End the Session</h4>") self.pushButton.clicked.connect(self.window3) def window3(self): # <=== self.w = Window() self.w.show() self.hide() class Window(QMainWindow): def __init__(self): super().__init__() self.title = "Login Window" self.top = 100 self.left = 100 self.width = 300 self.height = 200 self.pushButton = QPushButton("Login", self) self.pushButton.move(100, 75) self.pushButton.setToolTip("<h4>Start the Session</h4>") self.pushButton.clicked.connect(self.window2) self.main_window() def main_window(self): self.label = QLabel("The Cute App", self) self.label.move(100, 50) self.setWindowTitle(self.title) self.setFixedSize(self.width, self.height) self.move(self.top, self.left) 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())