multiprocessANDpexpectEXAMPLEkivy

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty
import sys
if sys.platform == 'win32':
    import winpexpect
elif sys.platform == 'linux' or sys.platform == 'linux32':
    import pexpect
from multiprocessing import Process, Queue


Builder.load_string('''
#:kivy 1.8.0

<RootWidget>:
    label_text: label_text
    Label:
        id: label_text
        text: 'initial'
        ''')


def puthello(q):
    if sys.platform == 'win32':
        child = winpexpect.winspawn("cmd", timeout=9000)
    elif sys.platform == 'linux' or sys.platform == 'linux32':
        child = pexpect.spawn("cmd", timeout=9000)
    while True:
        child.sendline('echo hello')
        child.expect('\r\n')
        q.put(child.before+child.after)


class RootWidget(BoxLayout):
    """Root Kivy widget class"""
    label_text = ObjectProperty()
    q = Queue()
    p = Process(target=puthello, args=(q,))

    def __init__(self):
        super(RootWidget, self).__init__()
        self.launchprocess()

    def launchprocess(self):
        self.p.start()
        while True:
            print self.q.get()
            self.label_text.text = self.q.get()


class ExampleApp(App):
    def build(self):
        return RootWidget()


if __name__ == '__main__':
    ExampleApp().run()