kivi_subprocess_output.py

from kivy.app import App
from kivy.uix.widget import Widget
from subprocess import call, check_output
from kivy.uix.label import Label


class field(Widget):
    def __init__(self, **kwargs):
        super(field,self).__init__(**kwargs)
        self.gc()

    def gc(self, **kwargs):
        label=Label(text=str(check_output('python ../PrintTest.py')))
        self.add_widget(label)

class mainC(App):
    def build(self):
        return field()


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