Why is env.render() not working on Jupyter?-CodePudding

I installed Anaconda and downloaded some code. It´s the classic OpenAI project, in this case Getting Started With OpenAI Gym | Paperspace Blog However, when I type

env.render(mode = “human”)

It says (see below). The same happens in a different computer with a fresh Anaconda installation:

ImportError Traceback (most recent call last) File /opt/anaconda3/lib/python3.9/site-packages/gym/envs/classic_control/rendering.py:25, in 24 try: —> 25 from pyglet.gl import * 26 except ImportError as e:

File /opt/anaconda3/lib/python3.9/site-packages/pyglet/gl/init.py:95, in 36 “”“OpenGL and GLU interface. 37 38 This package imports all OpenGL, GLU and registered OpenGL extension (…) 92 below. 93 “”” —> 95 from pyglet.gl.lib import GLException 96 from pyglet.gl.gl import *

File /opt/anaconda3/lib/python3.9/site-packages/pyglet/gl/lib.py:147, in 146 elif pyglet.compat_platform == ‘darwin’: → 147 from pyglet.gl.lib_agl import link_GL, link_GLU, link_AGL 148 else:

File /opt/anaconda3/lib/python3.9/site-packages/pyglet/gl/lib_agl.py:43, in 41 all = [‘link_GL’, ‘link_GLU’, ‘link_AGL’] —> 43 gl_lib = pyglet.lib.load_library(framework=‘/System/Library/Frameworks/OpenGL.framework’) 44 agl_lib = pyglet.lib.load_library(framework=‘/System/Library/Frameworks/AGL.framework’)

File /opt/anaconda3/lib/python3.9/site-packages/pyglet/lib.py:124, in LibraryLoader.load_library(self, *names, **kwargs) 123 if ‘framework’ in kwargs and self.platform == ‘darwin’: → 124 return self.load_framework(kwargs[‘framework’]) 126 if not names:

File /opt/anaconda3/lib/python3.9/site-packages/pyglet/lib.py:279, in MachOLibraryLoader.load_framework(self, path) 277 return lib → 279 raise ImportError(“Can’t find framework %s.” % path)

ImportError: Can’t find framework /System/Library/Frameworks/OpenGL.framework.

During handling of the above exception, another exception occurred:

ImportError Traceback (most recent call last) Input In [4], in <cell line: 1>() ----> 1 env.render(mode = “human”)

File /opt/anaconda3/lib/python3.9/site-packages/gym/core.py:240, in Wrapper.render(self, mode, **kwargs) 239 def render(self, mode=‘human’, **kwargs): → 240 return self.env.render(mode, **kwargs)

File /opt/anaconda3/lib/python3.9/site-packages/gym/envs/classic_control/mountain_car.py:126, in MountainCarEnv.render(self, mode) 123 carheight = 20 125 if self.viewer is None: → 126 from gym.envs.classic_control import rendering 127 self.viewer = rendering.Viewer(screen_width, screen_height) 128 xs = np.linspace(self.min_position, self.max_position, 100)

File /opt/anaconda3/lib/python3.9/site-packages/gym/envs/classic_control/rendering.py:27, in 25 from pyglet.gl import * 26 except ImportError as e: —> 27 raise ImportError(‘’’ 28 Error occurred while running from pyglet.gl import

29 HINT: make sure you have OpenGL install. On Ubuntu, you can run ‘apt-get install python-opengl’. 30 If you’re running on a server, you may need a virtual frame buffer; something like this should work: 31 ‘xvfb-run -s "-screen 0 1400x900x24" python <your_script.py>’ 32 ‘’') 34 import math 35 import numpy as np

ImportError: Error occurred while running from pyglet.gl import * HINT: make sure you have OpenGL install. On Ubuntu, you can run ‘apt-get install python-opengl’. If you’re running on a server, you may need a virtual frame buffer; something like this should work: ‘xvfb-run -s “-screen 0 1400x900x24” python <your_script.py>’

CodePudding user response：

From the stack trace:

ImportError: Can’t find framework /System/Library/Frameworks/OpenGL.framework.

...

29 HINT: make sure you have OpenGL install. On Ubuntu, you can run ‘apt-get install python-opengl’.

Install OpenGL .

CodePudding user response：

After trying many different installations, changes of environments, etc. etc. This finally worked for me, in case someone else has the same problem:

pip install --user --upgrade git http://github.com/pyglet/[email protected]

I found it in github.com/pyglet/pyglet/pull/335 in case someone wants to see the context.