Kivy output 黑屏

Question

I wrote a simple app using kivy python but when I run it on my desktop it shows me a black screen I've tried all solution from StackOverflow but it doesn't work

from kivy.app import App
from kivy.uix.label import Label


class Lesson1App(App):
    def build(self):
        lbl = Label(text='Hello World!')
        return lbl


if __name__ == '__main__':
    Lesson1App().run()

this is what it shows me on CMD

[INFO   ] [deps        ] Successfully imported "kivy_deps.gstreamer_dev" 0.2.0
[INFO   ] [deps        ] Successfully imported "kivy_deps.gstreamer" 0.1.18
[INFO   ] [deps        ] Successfully imported "kivy_deps.angle" 0.1.10
[INFO   ] [deps        ] Successfully imported "kivy_deps.glew" 0.1.12
[INFO   ] [deps        ] Successfully imported "kivy_deps.glew_dev" 0.2.0
[INFO   ] [deps        ] Successfully imported "kivy_deps.sdl2" 0.1.23
[INFO   ] [deps        ] Successfully imported "kivy_deps.sdl2_dev" 0.2.0
[INFO   ] [Kivy        ] v1.11.1
[INFO   ] [Kivy        ] Installed at "C:\Users\Santooryo\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\__init__.py"
[INFO   ] [Python      ] v3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:06:47) [MSC v.1914 32 bit (Intel)]
[INFO   ] [Python      ] Interpreter at "C:\Users\Santooryo\AppData\Local\Programs\Python\Python37-32\python.exe"
[INFO   ] [Factory     ] 184 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_sdl2, img_gif (img_pil, img_ffpyplayer ignored)
[INFO   ] [Text        ] Provider: sdl2
[INFO   ] [Window      ] Provider: sdl2
[INFO   ] [Window      ] Activate GLES2/ANGLE context
[INFO   ] [GL          ] Using the "OpenGL" graphics system
[INFO   ] [GL          ] Backend used <angle_sdl2>
[INFO   ] [GL          ] OpenGL version <b"OpenGL ES 2.0 (ANGLE 2.1.0.b'')">
[INFO   ] [GL          ] OpenGL vendor <b'Google Inc.'>
[INFO   ] [GL          ] OpenGL renderer <b'ANGLE (Intel(R) HD Graphics 3000 Direct3D11 vs_4_1 ps_4_1)'>
[INFO   ] [GL          ] OpenGL parsed version: 2, 0
[INFO   ] [GL          ] Shading version <b"OpenGL ES GLSL ES 1.00 (ANGLE 2.1.0.b'')">
[INFO   ] [GL          ] Texture max size <8192>
[INFO   ] [GL          ] Texture max units <16>
[INFO   ] [Window      ] auto add sdl2 input provider
[INFO   ] [Window      ] virtual keyboard not allowed, single mode, not docked
[INFO   ] [GL          ] NPOT texture support is available
[INFO   ] [Base        ] Start application main loop

Answer 1

I wrote a simple app using kivy python but when I run it on my desktop it shows me a black screen I've tried all solution from StackOverflow but it doesn't work

from kivy.app import App
from kivy.uix.label import Label


class Lesson1App(App):
    def build(self):
        lbl = Label(text='Hello World!')
        return lbl


if __name__ == '__main__':
    Lesson1App().run()

this is what it shows me on CMD

[INFO   ] [deps        ] Successfully imported "kivy_deps.gstreamer_dev" 0.2.0
[INFO   ] [deps        ] Successfully imported "kivy_deps.gstreamer" 0.1.18
[INFO   ] [deps        ] Successfully imported "kivy_deps.angle" 0.1.10
[INFO   ] [deps        ] Successfully imported "kivy_deps.glew" 0.1.12
[INFO   ] [deps        ] Successfully imported "kivy_deps.glew_dev" 0.2.0
[INFO   ] [deps        ] Successfully imported "kivy_deps.sdl2" 0.1.23
[INFO   ] [deps        ] Successfully imported "kivy_deps.sdl2_dev" 0.2.0
[INFO   ] [Kivy        ] v1.11.1
[INFO   ] [Kivy        ] Installed at "C:\Users\Santooryo\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\__init__.py"
[INFO   ] [Python      ] v3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:06:47) [MSC v.1914 32 bit (Intel)]
[INFO   ] [Python      ] Interpreter at "C:\Users\Santooryo\AppData\Local\Programs\Python\Python37-32\python.exe"
[INFO   ] [Factory     ] 184 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_sdl2, img_gif (img_pil, img_ffpyplayer ignored)
[INFO   ] [Text        ] Provider: sdl2
[INFO   ] [Window      ] Provider: sdl2
[INFO   ] [Window      ] Activate GLES2/ANGLE context
[INFO   ] [GL          ] Using the "OpenGL" graphics system
[INFO   ] [GL          ] Backend used <angle_sdl2>
[INFO   ] [GL          ] OpenGL version <b"OpenGL ES 2.0 (ANGLE 2.1.0.b'')">
[INFO   ] [GL          ] OpenGL vendor <b'Google Inc.'>
[INFO   ] [GL          ] OpenGL renderer <b'ANGLE (Intel(R) HD Graphics 3000 Direct3D11 vs_4_1 ps_4_1)'>
[INFO   ] [GL          ] OpenGL parsed version: 2, 0
[INFO   ] [GL          ] Shading version <b"OpenGL ES GLSL ES 1.00 (ANGLE 2.1.0.b'')">
[INFO   ] [GL          ] Texture max size <8192>
[INFO   ] [GL          ] Texture max units <16>
[INFO   ] [Window      ] auto add sdl2 input provider
[INFO   ] [Window      ] virtual keyboard not allowed, single mode, not docked
[INFO   ] [GL          ] NPOT texture support is available
[INFO   ] [Base        ] Start application main loop