Creating popup windows pyqt4

I'm trying to create a pop up window to run in the beginning of my program. I am wondering how to make my popup window show once I run my program and how to create a signal slot connection from that popup window to my main window using pyqt4 and qt4 designer?

To start off: I have created a new dialog called popup with two buttons, ok and cancel using qt4 designer. This is the window I would like to make a signal slot connection between the main window and the dialog. Thank you in advance.

Im trying to do the same thing. I have my main window class and in one of the methods I want to call a dailogUi popup window. I have no clue how.

Code:

---

from PyQt4 import QtGui, QtCore
import sys
import tweepy
import os
from my_functions import *
import libertasUi
import fileUi
import connectionUi
import pinUi
import webbrowser
 
class Libertas(QtGui.QWidget, libertasUi.Ui_Form):
    def __init__(self, parent=None):
        super(Libertas, self).__init__(parent)
        self.setupUi(self)
 
    def pop_ups(self, code):
        if code == 15:
            file_dailog =fileUi.Ui_Dialog()
            file_dailog.show
        elif code == 10:
            pass
        else:
            pass
 
 
    def main(self):
        self.show()
        self.get_lists()
 
 
if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    libertas = Libertas()
    libertas.main()
    app.exec_()

---

I made the dialog with qt designer and compiled it to fileUi.py. It is basically an oops! dialog "Cant find file"
I get the error

Code:

---

AttributeError: 'Ui_Dialog' object has no attribute 'show'
Segmentation fault

---

I dont see whats wrong.