PyQT equivalent of wx CallAfter?

Question

I recently switched from wxPython to PyQT and can't find an equivalent of CallAfter. I need to use pubsub due to some imports and with wx I just sent messages with CallAfter -- is there a way to do something similar in PyQT? Basically, I want to inject something into the mainloop with pyQT.

EDIT FOR MORE INFO:

In my old GUI, using wxPython, I was using python-openzwave which uses an old dispatcher module. I would capture the old dispatcher signals and convert them to pubsub messages (for ease of use) and send the new messages with a CallAfter like this:

wx.CallAfter(pub.sendMessage, messagePack.signal, message = messagePack.message)

And then I was able to update the GUI by capturing the message and working directly on the gui elements because it essentially injected something into the mainloop.

Now, using pyqt, there is no callafter so, I have the same system setup without the callafter but the actions that have to occur after the message is received can't happen because it is in the middle of the mainloop.

Answer 1

The closest thing I can think of is using QTimer.singleShot with a short timeout, which will force it into the next event loop.

def other_function(self):
    print 'other'

def my_function(self):
    print 'one'
    QTimer.singleShot(1, self.other_function)
    print 'two'

Qt has the idea of an event loop, where it will check if there are events that need processing, like a button click, or part of a widget needs to be redrawn, etc. Typically, a function gets called as the result of an event. The QTimer.singleShot will stick your function call at the end of the list of things to be processed on the next cycle of the event loop.

But I agree with some of the comments that you probably could just use a separate QObject running in another thread to handle the openzwave events and re-dispatch the messages as Qt Signals, which the main thread can listen for and update the GUI.