##USE Xlib VERSION 14!!!! NOT 15!!!!

from pymouse import PyMouseEvent

class Clickonacci(PyMouseEvent):
    def __init__(self):
        PyMouseEvent.__init__(self)

    def click(self, x, y, button, press):
        if button == 1:
            if press:
                print('click!')
        else:  # Exit if any other mouse button used
            self.stop()

C = Clickonacci()
C.run()