import sys from PyQt6.QtWidgets import QApplication, QWidget, QLabel, QVBoxLayout def main(): # 1. Initialize the application app = QApplication(sys.argv) # 2. Create the main window window = QWidget() window.setWindowTitle("My Hot PyQt6 App") # 3. Create a layout and add a widget layout = QVBoxLayout() label = QLabel("Hello, PyQt6!") layout.addWidget(label) window.setLayout(layout) # 4. Show the window and start the event loop window.show() sys.exit(app.exec()) if __name__ == "__main__": main() Use code with caution. 4. Key Concepts: Signals, Slots, and Layouts

Every PyQt6 application follows a fundamental structure to manage the window and user interactions.

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This is Qt's event-handling system. When a user clicks a button (emits a signal ), it triggers a specific function (the slot ).