Issue with using 'promote to' in QtDesigner with PyQt5

kprice

I've created a object called ImageViewer that inherits from QStackedImage. I wanted to use the 'promote to' function in QtDesigner to change my current QStackedImage to a ImageViewer object. I was a little confused about it asking for a header file in python for a while but eventually I figured it out. It imported correctly and even created a .pyc file which means it imported and compiled it correctly. The problem arises in my code when I try to set up the UI. A snippet is shown below.

qtCreatorFile = "EITDaq2.ui"
Ui_MainWindow, QtBaseClass = uic.loadUiType(qtCreatorFile)

class DAQView(QtWidgets.QMainWindow, Ui_MainWindow):

def __init__(self, model):
    # qt required window init stuff (from double inheritance)
    QtWidgets.QMainWindow.__init__(self)
    Ui_MainWindow.__init__(self)
    self.setupUi(self)

On the command 'self.setupUi(self)' I get the error:

self.setupUi(self)
File "<string>", line 257, in setupUi
TypeError: __init__() takes exactly 1 argument (2 given)

It seems like I'm passing it 1 parameter but maybe when I promote the new ImageViewer object into the ui file it makes it into a sister widget to the main window instead of a child widget so it's like passing in two parameters to the ui builder. I've checked all over the forum and haven't found anything. Much appreciation for any insight.