Problem with pyqt4

[eltico]

I need help from you guys..

I create this from pyqt4 designer
gpstec.py

but I need when click the buttons to open a dialog box asking for this for ex I have this:

lista=[]
 
def AgregarCoordenadas(coordenadas):
    global lista
    if isinstance (coordenadas,list)==True:
        if ValidarEstructura (coordenadas)==True:
            lista=coordenadas
        else:
            return ValidarEstructura(coordenadas)
    else:
        return formato()

lista=[]

def AgregarCoordenadas(coordenadas):
    global lista
    if isinstance (coordenadas,list)==True:
        if ValidarEstructura (coordenadas)==True:
            lista=coordenadas
        else:
            return ValidarEstructura(coordenadas)
    else:
        return formato()

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I want the first button when click just to open a dialog box asking for "coordanadas" and OK an then its done lista=coordenadas..

how do I do that... im a newbie at gui

thanks