Unable to send signal from QPushButton created in Python loop

[Killian]

It's most likely your lambda definition that is causing this confusion. The signal is correct and that boolean is coming from the signal's standard parameter. Have a look at : http://doc.qt.io/qt-5/qabstractbutton.html#clicked
As far as I remember your button parameter will be overwritten with that boolean, so you should rather do something like this:

ui.cmdOpen.clicked.connect(lambda state, button=ui.cmdOpen:displayOrder(button))

ui.cmdOpen.clicked.connect(lambda state, button=ui.cmdOpen:displayOrder(button))

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