You can use the Qt cross-platform toolkit to customize Maya's user interface.
Maya has its own application object that is passed to a Qt plug-in. Because of this, you do not have to create your own QApplication object.
You can use QApplication.instance() or the qApp macro to get a reference to the Maya QApplication object. You can call QApplication.instance() and qApp more than once to get more than one reference to the Maya QApplication object.
Important: Do not create new QApplication objects.
Once you have your reference to the Maya QApplication object, you can then use the standard Qt calls to to create your plug-in application. See the Qt documentation for more information.
from PySide2.QtCore import Qt from PySide2.QtWidgets import QApplication, QPushButton app = QApplication.instance() button = QPushButton("About Qt") button.clicked.connect(app.aboutQt) button.setAttribute(Qt.WA_DeleteOnClose) button.show()
Note: If you are using layouts with Maya and Qt, you will need to understand the details of how Maya and Qt layouts interact. See the documentation for MQUtil in the C++ Reference for detailed information about how Maya and Qt layouts work together.