Displaying the currently selected node externally from Maya

from PyQt4.QtCore import *
from PyQt4.QtGui import *


class Window(QWidget):
    """Externally, display currently selected item from Maya"""

    def __init__(self, parent=None):
        super(Window, self).__init__(parent)

        label = QLabel("Currently selected node", self)
        field = QLineEdit(self)
        field.setEnabled(False)
        field.setObjectName('Field')
        close = QPushButton('Close', self)

        layout = QVBoxLayout(self)
        layout.addWidget(label)
        layout.addWidget(field)
        layout.addWidget(close)

        close.pressed.connect(self.close)

    def set(self, node):
        field = self.findChild(QLineEdit, 'Field')
        field.setText(node)


if __name__ == '__main__':
    import sys

    app = QApplication(sys.argv)

    window = Window()
    window.show()

    sys.exit(app.exec_())