A QPushButton that checks for the shift key modifier

button_shift_click.py

"""
Record various key press states from a custom QPushButton
"""

from PyQt4 import QtGui, QtCore 

class Button(QtGui.QPushButton):

	def __init__(self, *args, **kwargs):
		super(Button, self).__init__(*args, **kwargs)
		self.__isShiftPressed = False

		self.clicked.connect(self.handleClick)

	def keyPressEvent(self, event):
		super(Button, self).keyPressEvent(event)
		self._processKeyEvent(event)

	def keyReleaseEvent(self, event):
		super(Button, self).keyReleaseEvent(event)
		self._processKeyEvent(event)

	def _processKeyEvent(self, event):
		isShift = event.modifiers() & QtCore.Qt.ShiftModifier
		self.__isShiftPressed = bool(isShift)

	def handleClick(self):
		print "Shift pressed?", self.__isShiftPressed


if __name__ == "__main__":
	app = QtGui.QApplication([])
	button = Button("Click me")
	button.show()
	button.raise_()
	app.exec_()

button_shift_click2.py

"""
Check the keyboard modifiers from the static QApplication call
"""

from PyQt4 import QtGui, QtCore 

def handleClick():
	mods = QtGui.QApplication.keyboardModifiers()
	isShiftPressed =  mods & QtCore.Qt.ShiftModifier
	print "Shift pressed?", bool(isShiftPressed)

if __name__ == "__main__":
	app = QtGui.QApplication([])
	button = QtGui.QPushButton("Click me")
	button.clicked.connect(handleClick)
	button.show()
	button.raise_()
	app.exec_()