Python Spyder initializing Hello World Kivi app once?

Question

Does anyone know why Python\'s 2.7 Spyder is successfully initializing the \'Hello World\' Kivy app just once, i.e. hitting F5 brings the window app, but when I close it and

Answer 1

Refer to the webpage: https://groups.google.com/forum/m/#!topic/kivy-users/yfhH7skAEJA, it gave a solution for fixing this issue, I rewrite the code as below,

from kivy.app import App
from kivy.uix.button import Button

class TestApp(App):
   def build(self):
      return Button(text='Hello World')

def reset():
import kivy.core.window as window
from kivy.base import EventLoop
if not EventLoop.event_listeners:
    from kivy.cache import Cache
    window.Window = window.core_select_lib('window', window.window_impl, True)
    Cache.print_usage()
    for cat in Cache._categories:
        Cache._objects[cat] = {}

if __name__ == '__main__':
   reset()
   TestApp().run()

The reset() function will clean up the Window's state and run the TestApp() normally.