Button
-------

.. code-block:: python
   :caption: scripts/PYQT2/01_main_widget/03_button/main.py
   :linenos:

   from PyQt5.QtWidgets import (
       QMainWindow, QApplication, QPushButton
   )

   class MainWindow(QMainWindow, object):
       def __init__(self, parent=None):
           super(MainWindow, self).__init__(parent)
           # Create a button
           self.button = QPushButton("This is a button!", self)
           # Set the position and size of the button
           self.button.move(50, 20)
           self.button.setFixedSize(100, 50)
       
   if __name__ == "__main__":
       app = QApplication([])
       mainWindow = MainWindow()
       mainWindow.show()
       app.exec_()

- This example uses the ``QPushButton`` widget to add a button. A button is one of the primary widgets for receiving user input.