Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "Mount the downloaded WebStorm-10*.dmg disk image file as another disk in your system."

A block of code is set as follows:

#!/usr/bin/env python
import gym
env = gym.make("Qbert-v0")
MAX_NUM_EPISODES = 10
MAX_STEPS_PER_EPISODE = 500

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

for episode in range(MAX_NUM_EPISODES):
    obs = env.reset()
    for step in range(MAX_STEPS_PER_EPISODE):
        env.render()

Any command-line input or output is written as follows:

$ python get_observation_action_space.py 'MountainCar-v0'

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Select System info from the Administration panel."