how to pass arguments between pythons scripts?

[electricDesire]

Hello, everybody,
I'm new in python and i'm trying to pass arguments between different scripts but they only update one way:
i'm calling the first script in maya with a shelf in maya like this:

try:
        myPM.close()
except:pass
import sys
sys.path.append("C:/Users/manue/Desktop/test")
import UiMayaTest as SBIRP
reload(SBIRP)
myPM = SBIRP.createUI()

this called script 'UiMayaTest.py' is a simple window with an intField entry and a button:

import sys
import maya.cmds as cmds
from functools import partial

def buttonPressed(episode, *args):
    passValue(episode, *args)
    print '============== buttonPressed ================'
    print 'EpisodeName ', EpisodeName

    Var = ''
    import UiMayaTestFunction
    Var = UiMayaTestFunction.FindVarFunc(EpisodeName,Var)
    print 'Var : ',Var

def createUI(): 
    myWindow = "SomeWindow"
    if cmds.window(myWindow,ex=True):
        cmds.deleteUI(myWindow)
    cmds.window(myWindow)
    cmds.columnLayout( adjustableColumn=True )
    cmds.text( label='Episode:  ', align='left' )
    episode = cmds.intField( "Episode", minValue = 100, maxValue = 1000, value =100)
    cmds.button(l="Open Last LIT scene", w=150, h=30, command=partial(buttonPressed,episode))
    cmds.setParent("..")
    cmds.showWindow()

def passValue(episode, *args):
    global EpisodeName
    EpisodeName = `cmds.intField( episode, query = True, value = True)

`

and the script called by it is called 'UiMayaTestFunction.py' and just return a variable called Var:

def FindVarFunc(EpisodeName, Var):
    print '============== FindVarFunc ================'
    print 'EpisodeName:' , EpisodeName 
    Var = 'Hello world'
    print 'Var: ',Var
    return Var

the variable 'EpisodeName' from UiMayaTest to UiMayaTestFunction is well updated each time i press the button,
but if i change the variable Var = 'Hello world' in UiMayaTestFunction by for example Var = 'Gnnn', it doesn't update it,
i've got always the same print or 'Var'... 'Hello world'
Thanks by advance for any help...