How to save acceleration data in a file on my android device using python kivy? -

i used jsonstorage , pickle did not work. maybe doing wrong way? activity appears , disappears. log says handler error. in update() function value storing txt variable. want store txt in external file on mobile phone.

my code:

__version__ = '1.0' # declare app version. used buildozer   kivy.app import app # main app kivy.uix.floatlayout import floatlayout # ui layout kivy.uix.label import label # label show information plyer import accelerometer # object read accelerometer kivy.clock import clock # clock schedule method  class ui(floatlayout): # app ui     def __init__(self, **kwargs):         super(ui, self).__init__(**kwargs)         self.lblacce = label(text="accelerometer: ") # create label @ center         self.add_widget(self.lblacce) # add label @ screen         try:             accelerometer.enable() # enable accelerometer             # if want disable it, run: accelerometer.disable()             clock.schedule_interval(self.update, 2.0/1) # 24 calls per second         except:             self.lblacce.text = "failed start accelerometer" # error      def update(self, dt):         txt = ""         try:             txt = "accelerometer:\nx = %.2f\ny = %.2f\nz = %2.f " %(             accelerometer.acceleration[0], # read x value             accelerometer.acceleration[1], # y             accelerometer.acceleration[2]) # z         except:             txt = "cannot read accelerometer!" # error         self.lblacce.text = txt # add correct text    class accelerometer(app): # our app     def build(self):         ui = ui() # create ui         return ui # show  if __name__ == '__main__':     accelerometer().run() # start our app 

just use json store.it surely work. here code : add import jsonstore jsonstore=(/storage/emulated/0/hello.json); json.put(txt)