Maya-Python] get the cmds.intField when button pressed?

[emmanuelle manue154]

Hello, i need to make an ui layout in python inside maya,
it is asking some questions and when the button is pressed,
put the entries of intField or textField into variables...
very simple but i can't find the solution: "if button pressed?"...
thank you to help me!!

import maya.cmds as cmds
window = cmds.window(title = "Open Last scene", width = 150, height = 100)
cmds.rowColumnLayout( numberOfColumns=2, columnAttach=(1, 'left', 0), columnWidth=[(1, 100), (2, 250)] )
cmds.text( label='Episode:  ', align='left' )
cmds.intField( "Episode", minValue = 0, maxValue = 100, value = 0)
cmds.separator( h=5, style='none' )
cmds.rowColumnLayout( numberOfColumns=1, columnAttach=(1, 'left', 0), columnWidth=[(1, 100), (2, 250)] )
cmds.button('Open', l="Open Last scene", w=180, h=30)
cmds.showWindow()

#if button pressed??
    #put the intField into a variable:
    EpisodeName = `cmds.intField( "Episode", query = True, value = True)`
    print EpisodeName