Official Python bindings for Qt
pysidepyside-uic$ python3 -c "import PySide2.QtWidgets as QtWidgets; app = QtWidgets.QApplication([]); btn = QtWidgets.QPushButton('Hello'); btn.show(); app.exec_()"$ pyside-uic myapp.ui -o myapp_ui.py$ python3 -c "import PySide2; print(PySide2.__version__)"