python - pyqt timer does not return a value or an error -

i trying use timer pyqt. code below, not print , not error. know wrong?
thanks

import functools pyqt4.qtcore import qtimer  def ontimer(initparams):     print initparams     print "here"     # code here... def update():     print "upd" myinitparams = "init!" timercallback = functools.partial(ontimer, myinitparams) mytimer = qtimer() mytimer.timeout.connect(timercallback) mytimer.start(1000) #once sec  t = qtimer()  t.start(500) t.timeout.connect(update) 

edit update:

so snip of full code im using, bit more complicated , maybe different problem, result same.

the structure this:

from pyqt4 import qtcore, qtgui # import ui classes ui directory in package ui.moangui import ui_moanwindow  class moanwin(qtgui.qdialog, ui_moanwindow):     def __init__(self, parent=none):         super(moanwin, self).__init__(parent=parent)          self.setupui(self)         self.playmarkers.clicked.connect(self._playmarkers)         self.connect(self,qtcore.signal("playmarker"),playmarkercall)         #marker stop         self.stopmarkers.clicked.connect(self._stopmarkers)         self.connect(self,qtcore.signal("stopmarker"),stopmarkercall)      def _stopmarkers(self):         arg = "stop"         self.emit(qtcore.signal("stopmarker"),arg)     def _playmarkers(self):         fps = self.fpsbox.value()         starttime = self.fromtime.value()         endtime = self.totime.value()         arg = [fps,starttime,endtime]         self.emit(qtcore.signal("playmarker"),arg)  def stopmarkercall(arg):     #i want stop timer here  def playmarkercall(arg):      #i tried this, again, nothing happens, no error     myinitparams = "init!"     timercallback = functools.partial(timercall, myinitparams)     mytimer = qtcore.qtimer()     mytimer.timeout.connect(timercallback)     mytimer.start(1000) #once sec      #i imagine this:     mytimer = qtcore.qtimer()     in range(start,end):          # want connect view marker function need pass variable          mytimer.timeout.connect(viewmarkercall(i))          mytimer.start(1000) def timercall(args):     print "here", args  def show():     global globalmoanwindow     app = qtgui.qapplication(sys.argv)     globalmoanwindow = moanwin()     globalmoanwindow.show()     sys.exit(app.exec_())     return globalmoanwindow  show() 

my goal have button click play, , stuff happens in qtgraphic widget @ time interval, stop button stops playing. found functools question on here, im not sure if correct thing do.

to correctly use qt, need set qtgui.qapplication or qtcore.qcoreapplication , use it's event loop process events.

this should work:

#from utils import sigint  import functools pyqt4.qtcore import qtimer, qcoreapplication app = qcoreapplication([])  def ontimer(initparams):     print initparams     print "here"     # code here... def update():     print "upd" myinitparams = "init!" timercallback = functools.partial(ontimer, myinitparams) mytimer = qtimer() mytimer.timeout.connect(timercallback) mytimer.start(1000) #once sec  t = qtimer()  t.start(500) t.timeout.connect(update)  # use timer stop event loop after time stoptimer = qtimer(timeout=app.quit, singleshot=true) stoptimer.start(4000)  app.exec_() 

edit:

in updated version don't keep reference timer object create in playmarkercall method. when mytimer goes out of scope, destroyed (together underlying c++ qt object), that's why timer never fires.
, can't pass parameters when connect signal slots, @ time set connection. parameters can passed when signal emitted, create class derived qtimer , override it's timerevent method emit signal arguments specified when instantiating timer.