console.log

0 $ python train.py
WARN: gym.spaces.Box autodetected dtype as <class 'numpy.float32'>. Please provide explicit dtype.
WARN: You are calling 'step()' even though this environment has already returned done = True. You should always call 'reset()' once you receive 'done = True' -- any further steps are undefined behavior.
Exception ignored in: <function Viewer.__del__ at 0x119f546a8>
Traceback (most recent call last):
  File "/Users/jagill/.envs/gym/lib/python3.7/site-packages/gym/envs/classic_control/rendering.py", line 143, in __del__
  File "/Users/jagill/.envs/gym/lib/python3.7/site-packages/gym/envs/classic_control/rendering.py", line 62, in close
  File "/Users/jagill/.envs/gym/lib/python3.7/site-packages/pyglet/window/cocoa/__init__.py", line 281, in close
  File "/Users/jagill/.envs/gym/lib/python3.7/site-packages/pyglet/window/__init__.py", line 770, in close
ImportError: sys.meta_path is None, Python is likely shutting down
0 $ python --version
Python 3.7.0
0 $ pip freeze
appnope==0.1.0
backcall==0.1.0
certifi==2018.4.16
chardet==3.0.4
decorator==4.3.0
future==0.16.0
gym==0.10.5
idna==2.7
ipython==6.5.0
ipython-genutils==0.2.0
jedi==0.12.1
numpy==1.15.0
parso==0.3.1
pexpect==4.6.0
pickleshare==0.7.4
prompt-toolkit==1.0.15
ptyprocess==0.6.0
pyglet==1.3.2
Pygments==2.2.0
requests==2.19.1
simplegeneric==0.8.1
six==1.11.0
traitlets==4.3.2
urllib3==1.23
wcwidth==0.1.7
# System: MacOS High Sierra 10.13.5 (17F77)

train.py

import gym
env = gym.make('CartPole-v0')
env.reset()
for _ in range(1000):
    env.render()
    env.step(env.action_space.sample()) # take a random action