Empty Window
-------------

.. code-block:: python
   :caption: scripts/PYQT2/01_main_widget/01_empty/main.py
   :linenos:

   from PyQt5.QtWidgets import (
       QMainWindow, QApplication
   )

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

   if __name__ == "__main__":
       app = QApplication([])
       mainWindow = MainWindow()
       mainWindow.show()
       app.exec_()

- This example only displays a basic window based on ``QMainWindow``.
- No special widgets or elements are added.
- ``QMainWindow`` is the primary window class in PyQt5.
- Various widgets, toolbars, menubars, status bars, etc. can be added to it.