Example of how to use PyQt to popup a dialog at current mouse pos, and close in response to ESC keyc

pyqt_popup_close.py

from PyQt4 import QtCore, QtGui

class Dialog(QtGui.QDialog):

	def __init__(self, parent=None):
		super(Dialog, self).__init__(parent)
		self.resize(300,200)


	def showEvent(self, event):
		geom = self.frameGeometry()
		geom.moveCenter(QtGui.QCursor.pos())
		self.setGeometry(geom)
		super(Dialog, self).showEvent(event)


	def keyPressEvent(self, event):
		if event.key() == QtCore.Qt.Key_Escape:
			self.hide()
			event.accept()
		else:
			super(Dialog, self).keyPressEvent(event)


if __name__ == "__main__":
	app = QtGui.QApplication([])

	d = Dialog()
	d.show()
	d.raise_()

	app.exec_()