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各位大佬能否解惑一下中4.7式最终的约等号是怎么得出的？

def _step => def step 等

I do as the book, add the new environment to classical_control
when do the env=gym.make(’GridWorld-v0‘）

I got warnings when running gridworld-v0. Please check it.

/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/gym/logger.py:30: UserWarning: �[33mWARN: Environment '<class 'grid_mdp.GridEnv'>' has deprecated methods '_step' and '_reset' rather than 'step' and 'reset'. Compatibility code invoked. Set _gym_disable_underscore_compat = True to disable this behavior.�[0m
warnings.warn(colorize('%s: %s'%('WARN', msg % args), 'yellow'))

Exception ignored in: <bound method Viewer.del of <gym.envs.classic_control.rendering.Viewer object at 0x7fa59323ea58>>
Traceback (most recent call last):
File "/usr/local/lib/python3.5/dist-packages/gym/envs/classic_control/rendering.py", line 143, in del
File "/usr/local/lib/python3.5/dist-packages/gym/envs/classic_control/rendering.py", line 62, in close
File "/usr/local/lib/python3.5/dist-packages/pyglet/window/xlib/init.py", line 474, in close
File "/usr/local/lib/python3.5/dist-packages/pyglet/gl/xlib.py", line 343, in destroy
File "/usr/local/lib/python3.5/dist-packages/pyglet/gl/base.py", line 333, in destroy
File "/usr/local/lib/python3.5/dist-packages/pyglet/gl/xlib.py", line 333, in detach
File "/usr/local/lib/python3.5/dist-packages/pyglet/gl/lib.py", line 96, in errcheck
File "", line 969, in _find_and_load
File "", line 954, in _find_and_load_unlocked
File "", line 887, in _find_spec
TypeError: 'NoneType' object is not iterable

self.t['1_s'] = 6 可以定义为 self.t[1, 's'] = 6 更自然

@everyone 请问怎么编写一个3D环境

郭老师您好，我购买了您的《深入浅出强化学习》想看代码来辅助学习。不过您书中给的连接只有第二章的代码。请问其他章节的代码应该如果获得呢