Question

I am dealing with 2 windows . One is created by Qt Designer and i import it
on test.py program . what i did i make a Widget on the test program and
than add a button to it and on click event I try to popup the other
window(gui1.py) created by Qt Designer but it never pop ups and when i use
break and do line by line debugging it shows me this message after running
this command “myapp2 = MyForm()” on line number 35 test.py .

QCoreApplication::exec: The event loop is already running

and once i pressed enter on the terminal it pop up the other window .

I am confuse where i am wrong .

Thanks
test.py
gui1.py

Answer 1

The reason the other window doesn’t appear, is because you are not keeping a reference to it, and so it gets garbage-collected immediately after it is shown.

To fix the problem, you could either store the window instance it as an attribute, or give it a parent:

def local_manag(self):
    print "pressed"
    # store it as an attribute
    self.myapp2 = MyForm()
    self.myapp2.show()
    # or give it a parent
    # myapp2 = MyForm(self)
    # myapp2.show()