from msvcrt import getch

def select():
    #do something

def moveDown():
    #do something

def moveUp():
    #do something

def main3():
    while True:
        key = ord(getch())
        if key == 27: #escape
            break
        elif key == 13:　#enter
            select()

        elif key == 224: #Special keys (arrows, F keys, ins, del, etc.)
            key = ord(getch())
            if key == 80: #Up arrow
                moveDown()
            elif key == 72: #Down arrow
                moveUp()

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