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<p class="caption" role="heading"><span class="caption-text">Introduction</span></p>
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<article role="main">
<section id="register-and-make">
<h1>Register and Make<a class="headerlink" href="#register-and-make" title="Permalink to this heading">#</a></h1>
<p>Gymnasium allows users to automatically load environments, pre-wrapped with several important wrappers through the <a class="reference internal" href="#gymnasium.make" title="gymnasium.make"><code class="xref py py-meth docutils literal notranslate"><span class="pre">gymnasium.make()</span></code></a> function. To do this, the environment must be registered prior with <a class="reference internal" href="#gymnasium.register" title="gymnasium.register"><code class="xref py py-meth docutils literal notranslate"><span class="pre">gymnasium.register()</span></code></a>. To get the environment specifications for a registered environment, use <a class="reference internal" href="#gymnasium.spec" title="gymnasium.spec"><code class="xref py py-meth docutils literal notranslate"><span class="pre">gymnasium.spec()</span></code></a> and to print the whole registry, use <a class="reference internal" href="#gymnasium.pprint_registry" title="gymnasium.pprint_registry"><code class="xref py py-meth docutils literal notranslate"><span class="pre">gymnasium.pprint_registry()</span></code></a>.</p>
<dl class="py function">
<dt class="sig sig-object py" id="gymnasium.make">
<span class="sig-prename descclassname"><span class="pre">gymnasium.</span></span><span class="sig-name descname"><span class="pre">make</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">id</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">str</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><a class="reference internal" href="#gymnasium.envs.registration.EnvSpec" title="gymnasium.envs.registration.EnvSpec"><span class="pre">EnvSpec</span></a></span></em>, <em class="sig-param"><span class="n"><span class="pre">max_episode_steps</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">int</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">None</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">autoreset</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">bool</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">None</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">apply_api_compatibility</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">bool</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">None</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">disable_env_checker</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">bool</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">None</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">**</span></span><span class="n"><span class="pre">kwargs</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">Any</span></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">&#x2192;</span> <span class="sig-return-typehint"><a class="reference internal" href="../env/#gymnasium.Env" title="gymnasium.Env"><span class="pre">Env</span></a></span></span><a class="headerlink" href="#gymnasium.make" title="Permalink to this definition">#</a></dt>
<dd><p>Creates an environment previously registered with <a class="reference internal" href="#gymnasium.register" title="gymnasium.register"><code class="xref py py-meth docutils literal notranslate"><span class="pre">gymnasium.register()</span></code></a> or a <code class="xref py py-class docutils literal notranslate"><span class="pre">EnvSpec</span></code>.</p>
<p>To find all available environments use <code class="docutils literal notranslate"><span class="pre">gymnasium.envs.registry.keys()</span></code> for all valid ids.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>id</strong> – A string for the environment id or a <code class="xref py py-class docutils literal notranslate"><span class="pre">EnvSpec</span></code>. Optionally if using a string, a module to import can be included, e.g. <code class="docutils literal notranslate"><span class="pre">'module:Env-v0'</span></code>.
This is equivalent to importing the module first to register the environment followed by making the environment.</p></li>
<li><p><strong>max_episode_steps</strong> – Maximum length of an episode, can override the registered <code class="xref py py-class docutils literal notranslate"><span class="pre">EnvSpec</span></code> <code class="docutils literal notranslate"><span class="pre">max_episode_steps</span></code>.
The value is used by <a class="reference internal" href="../wrappers/misc_wrappers/#gymnasium.wrappers.TimeLimit" title="gymnasium.wrappers.TimeLimit"><code class="xref py py-class docutils literal notranslate"><span class="pre">gymnasium.wrappers.TimeLimit</span></code></a>.</p></li>
<li><p><strong>autoreset</strong> – Whether to automatically reset the environment after each episode (<a class="reference internal" href="../wrappers/misc_wrappers/#gymnasium.wrappers.AutoResetWrapper" title="gymnasium.wrappers.AutoResetWrapper"><code class="xref py py-class docutils literal notranslate"><span class="pre">gymnasium.wrappers.AutoResetWrapper</span></code></a>).</p></li>
<li><p><strong>apply_api_compatibility</strong> – Whether to wrap the environment with the <a class="reference internal" href="../wrappers/misc_wrappers/#gymnasium.wrappers.StepAPICompatibility" title="gymnasium.wrappers.StepAPICompatibility"><code class="xref py py-class docutils literal notranslate"><span class="pre">gymnasium.wrappers.StepAPICompatibility</span></code></a> wrapper that
converts the environment step from a done bool to return termination and truncation bools.
By default, the argument is None in which the <code class="xref py py-class docutils literal notranslate"><span class="pre">EnvSpec</span></code> <code class="docutils literal notranslate"><span class="pre">apply_api_compatibility</span></code> is used, otherwise this variable is used in favor.</p></li>
<li><p><strong>disable_env_checker</strong> – If to add <a class="reference internal" href="../wrappers/misc_wrappers/#gymnasium.wrappers.PassiveEnvChecker" title="gymnasium.wrappers.PassiveEnvChecker"><code class="xref py py-class docutils literal notranslate"><span class="pre">gymnasium.wrappers.PassiveEnvChecker</span></code></a>, <code class="docutils literal notranslate"><span class="pre">None</span></code> will default to the
<code class="xref py py-class docutils literal notranslate"><span class="pre">EnvSpec</span></code> <code class="docutils literal notranslate"><span class="pre">disable_env_checker</span></code> value otherwise use this value will be used.</p></li>
<li><p><strong>kwargs</strong> – Additional arguments to pass to the environment constructor.</p></li>
</ul>
</dd>
<dt class="field-even">Returns<span class="colon">:</span></dt>
<dd class="field-even"><p><strong>An instance of the environment with wrappers applied.</strong></p>
</dd>
<dt class="field-odd">Raises<span class="colon">:</span></dt>
<dd class="field-odd"><p><strong>Error</strong> – If the <code class="docutils literal notranslate"><span class="pre">id</span></code> doesn’t exist in the <code class="xref py py-attr docutils literal notranslate"><span class="pre">registry</span></code></p>
</dd>
</dl>
</dd></dl>
<dl class="py function">
<dt class="sig sig-object py" id="gymnasium.register">
<span class="sig-prename descclassname"><span class="pre">gymnasium.</span></span><span class="sig-name descname"><span class="pre">register</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">id</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">str</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">entry_point</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">EnvCreator</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">str</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">None</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">reward_threshold</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">float</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">None</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">nondeterministic</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">bool</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">False</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">max_episode_steps</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">int</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">None</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">order_enforce</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">bool</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">True</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">autoreset</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">bool</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">False</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">disable_env_checker</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">bool</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">False</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">apply_api_compatibility</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">bool</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">False</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">additional_wrappers</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><sp
<dd><p>Registers an environment in gymnasium with an <code class="docutils literal notranslate"><span class="pre">id</span></code> to use with <a class="reference internal" href="#gymnasium.make" title="gymnasium.make"><code class="xref py py-meth docutils literal notranslate"><span class="pre">gymnasium.make()</span></code></a> with the <code class="docutils literal notranslate"><span class="pre">entry_point</span></code> being a string or callable for creating the environment.</p>
<p>The <code class="docutils literal notranslate"><span class="pre">id</span></code> parameter corresponds to the name of the environment, with the syntax as follows:
<code class="docutils literal notranslate"><span class="pre">[namespace/](env_name)[-v(version)]</span></code> where <code class="docutils literal notranslate"><span class="pre">namespace</span></code> and <code class="docutils literal notranslate"><span class="pre">-v(version)</span></code> is optional.</p>
<p>It takes arbitrary keyword arguments, which are passed to the <code class="xref py py-class docutils literal notranslate"><span class="pre">EnvSpec</span></code> <code class="docutils literal notranslate"><span class="pre">kwargs</span></code> parameter.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>id</strong> – The environment id</p></li>
<li><p><strong>entry_point</strong> – The entry point for creating the environment</p></li>
<li><p><strong>reward_threshold</strong> – The reward threshold considered for an agent to have learnt the environment</p></li>
<li><p><strong>nondeterministic</strong> – If the environment is nondeterministic (even with knowledge of the initial seed and all actions, the same state cannot be reached)</p></li>
<li><p><strong>max_episode_steps</strong> – The maximum number of episodes steps before truncation. Used by the <a class="reference internal" href="../wrappers/misc_wrappers/#gymnasium.wrappers.TimeLimit" title="gymnasium.wrappers.TimeLimit"><code class="xref py py-class docutils literal notranslate"><span class="pre">gymnasium.wrappers.TimeLimit</span></code></a> wrapper if not <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p></li>
<li><p><strong>order_enforce</strong> – If to enable the order enforcer wrapper to ensure users run functions in the correct order.
If <code class="docutils literal notranslate"><span class="pre">True</span></code>, then the <a class="reference internal" href="../wrappers/misc_wrappers/#gymnasium.wrappers.OrderEnforcing" title="gymnasium.wrappers.OrderEnforcing"><code class="xref py py-class docutils literal notranslate"><span class="pre">gymnasium.wrappers.OrderEnforcing</span></code></a> is applied to the environment.</p></li>
<li><p><strong>autoreset</strong> – If to add the <a class="reference internal" href="../wrappers/misc_wrappers/#gymnasium.wrappers.AutoResetWrapper" title="gymnasium.wrappers.AutoResetWrapper"><code class="xref py py-class docutils literal notranslate"><span class="pre">gymnasium.wrappers.AutoResetWrapper</span></code></a> such that on <code class="docutils literal notranslate"><span class="pre">(terminated</span> <span class="pre">or</span> <span class="pre">truncated)</span> <span class="pre">is</span> <span class="pre">True</span></code>, <a class="reference internal" href="../env/#gymnasium.Env.reset" title="gymnasium.Env.reset"><code class="xref py py-meth docutils literal notranslate"><span class="pre">gymnasium.Env.reset()</span></code></a> is called.</p></li>
<li><p><strong>disable_env_checker</strong> – If to disable the <a class="reference internal" href="../wrappers/misc_wrappers/#gymnasium.wrappers.PassiveEnvChecker" title="gymnasium.wrappers.PassiveEnvChecker"><code class="xref py py-class docutils literal notranslate"><span class="pre">gymnasium.wrappers.PassiveEnvChecker</span></code></a> to the environment.</p></li>
<li><p><strong>apply_api_compatibility</strong> – If to apply the <a class="reference internal" href="../wrappers/misc_wrappers/#gymnasium.wrappers.StepAPICompatibility" title="gymnasium.wrappers.StepAPICompatibility"><code class="xref py py-class docutils literal notranslate"><span class="pre">gymnasium.wrappers.StepAPICompatibility</span></code></a> wrapper to the environment.
Use if the environment is implemented in the gym v0.21 environment API.</p></li>
<li><p><strong>additional_wrappers</strong> – Additional wrappers to apply the environment.</p></li>
<li><p><strong>vector_entry_point</strong> – The entry point for creating the vector environment</p></li>
<li><p><strong>**kwargs</strong> – arbitrary keyword arguments which are passed to the environment constructor on initialisation.</p></li>
</ul>
</dd>
</dl>
</dd></dl>
<dl class="py function">
<dt class="sig sig-object py" id="gymnasium.spec">
<span class="sig-prename descclassname"><span class="pre">gymnasium.</span></span><span class="sig-name descname"><span class="pre">spec</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">env_id</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">str</span></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">&#x2192;</span> <span class="sig-return-typehint"><a class="reference internal" href="#gymnasium.envs.registration.EnvSpec" title="gymnasium.envs.registration.EnvSpec"><span class="pre">EnvSpec</span></a></span></span><a class="headerlink" href="#gymnasium.spec" title="Permalink to this definition">#</a></dt>
<dd><p>Retrieve the <code class="xref py py-class docutils literal notranslate"><span class="pre">EnvSpec</span></code> for the environment id from the <code class="xref py py-attr docutils literal notranslate"><span class="pre">registry</span></code>.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><p><strong>env_id</strong> – The environment id with the expected format of <code class="docutils literal notranslate"><span class="pre">[(namespace)/]id[-v(version)]</span></code></p>
</dd>
<dt class="field-even">Returns<span class="colon">:</span></dt>
<dd class="field-even"><p><strong>The environment spec if it exists</strong></p>
</dd>
<dt class="field-odd">Raises<span class="colon">:</span></dt>
<dd class="field-odd"><p><strong>Error</strong> – If the environment id doesn’t exist</p>
</dd>
</dl>
</dd></dl>
<dl class="py function">
<dt class="sig sig-object py" id="gymnasium.pprint_registry">
<span class="sig-prename descclassname"><span class="pre">gymnasium.</span></span><span class="sig-name descname"><span class="pre">pprint_registry</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">print_registry</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">dict</span><span class="p"><span class="pre">[</span></span><span class="pre">str</span><span class="p"><span class="pre">,</span></span><span class="w"> </span><a class="reference internal" href="#gymnasium.envs.registration.EnvSpec" title="gymnasium.envs.registration.EnvSpec"><span class="pre">EnvSpec</span></a><span class="p"><span class="pre">]</span></span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">registry</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">*</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">num_cols</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">int</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">3</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">exclude_namespaces</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">list</span><span class="p"><span class="pre">[</span></span><span class="pre">str</span><span class="p"><span class="pre">]</span></span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">None</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">disable_print</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">bool</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">False</span></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">&#x2192;</span> <span class="sig-return-typehint"><span class="pre">str</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">None</span></span></span><a class="headerlink" href="#gymnasium.pprint_registry" title="Permalink to this definition">#</a></dt>
<dd><p>Pretty prints all environments in the <code class="xref py py-attr docutils literal notranslate"><span class="pre">registry</span></code>.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>All arguments are keyword only</p>
</div>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>print_registry</strong> – Environment registry to be printed. By default, <code class="xref py py-attr docutils literal notranslate"><span class="pre">registry</span></code></p></li>
<li><p><strong>num_cols</strong> – Number of columns to arrange environments in, for display.</p></li>
<li><p><strong>exclude_namespaces</strong> – A list of namespaces to be excluded from printing. Helpful if only ALE environments are wanted.</p></li>
<li><p><strong>disable_print</strong> – Whether to return a string of all the namespaces and environment IDs
or to print the string to console.</p></li>
</ul>
</dd>
</dl>
</dd></dl>
<section id="core-variables">
<h2>Core variables<a class="headerlink" href="#core-variables" title="Permalink to this heading">#</a></h2>
<dl class="py class">
<dt class="sig sig-object py" id="gymnasium.envs.registration.EnvSpec">
<em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">gymnasium.envs.registration.</span></span><span class="sig-name descname"><span class="pre">EnvSpec</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">id:</span> <span class="pre">str</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">entry_point:</span> <span class="pre">EnvCreator</span> <span class="pre">|</span> <span class="pre">str</span> <span class="pre">|</span> <span class="pre">None</span> <span class="pre">=</span> <span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">reward_threshold:</span> <span class="pre">float</span> <span class="pre">|</span> <span class="pre">None</span> <span class="pre">=</span> <span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">nondeterministic:</span> <span class="pre">bool</span> <span class="pre">=</span> <span class="pre">False</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">max_episode_steps:</span> <span class="pre">int</span> <span class="pre">|</span> <span class="pre">None</span> <span class="pre">=</span> <span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">order_enforce:</span> <span class="pre">bool</span> <span class="pre">=</span> <span class="pre">True</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">autoreset:</span> <span class="pre">bool</span> <span class="pre">=</span> <span class="pre">False</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">disable_env_checker:</span> <span class="pre">bool</span> <span class="pre">=</span> <span class="pre">False</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">apply_api_compatibility:</span> <span class="pre">bool</span> <span class="pre">=</span> <span class="pre">False</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">kwargs:</span> <span class="pre">dict</span> <span class="pre">=</span> <span class="pre">&lt;factory&gt;</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">additional_wrappers:</span> <span class="pre">tuple[WrapperSpec</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">...]</span> <span class="pre">=</span> <span class="pre">&lt;factory&gt;</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">vector_entry_point:</span> <span class="pre">VectorEnvCreator</span> <span class="pre">|</span> <span class="pre">str</span> <span class="pre">|</span> <span class="pre">None</span> <span class="pre">=</span> <span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#gymnasium.envs.registration.EnvSpec" title="Permalink to this definition">#</a></dt>
<dd><p>A specification for creating environments with <a class="reference internal" href="#gymnasium.make" title="gymnasium.make"><code class="xref py py-meth docutils literal notranslate"><span class="pre">gymnasium.make()</span></code></a>.</p>
<ul class="simple">
<li><p><strong>id</strong>: The string used to create the environment with <a class="reference internal" href="#gymnasium.make" title="gymnasium.make"><code class="xref py py-meth docutils literal notranslate"><span class="pre">gymnasium.make()</span></code></a></p></li>
<li><p><strong>entry_point</strong>: A string for the environment location, <code class="docutils literal notranslate"><span class="pre">(import</span> <span class="pre">path):(environment</span> <span class="pre">name)</span></code> or a function that creates the environment.</p></li>
<li><p><strong>reward_threshold</strong>: The reward threshold for completing the environment.</p></li>
<li><p><strong>nondeterministic</strong>: If the observation of an environment cannot be repeated with the same initial state, random number generator state and actions.</p></li>
<li><p><strong>max_episode_steps</strong>: The max number of steps that the environment can take before truncation</p></li>
<li><p><strong>order_enforce</strong>: If to enforce the order of <a class="reference internal" href="../env/#gymnasium.Env.reset" title="gymnasium.Env.reset"><code class="xref py py-meth docutils literal notranslate"><span class="pre">gymnasium.Env.reset()</span></code></a> before <a class="reference internal" href="../env/#gymnasium.Env.step" title="gymnasium.Env.step"><code class="xref py py-meth docutils literal notranslate"><span class="pre">gymnasium.Env.step()</span></code></a> and <a class="reference internal" href="../env/#gymnasium.Env.render" title="gymnasium.Env.render"><code class="xref py py-meth docutils literal notranslate"><span class="pre">gymnasium.Env.render()</span></code></a> functions</p></li>
<li><p><strong>autoreset</strong>: If to automatically reset the environment on episode end</p></li>
<li><p><strong>disable_env_checker</strong>: If to disable the environment checker wrapper in <a class="reference internal" href="#gymnasium.make" title="gymnasium.make"><code class="xref py py-meth docutils literal notranslate"><span class="pre">gymnasium.make()</span></code></a>, by default False (runs the environment checker)</p></li>
<li><p><strong>kwargs</strong>: Additional keyword arguments passed to the environment during initialisation</p></li>
<li><p><strong>additional_wrappers</strong>: A tuple of additional wrappers applied to the environment (WrapperSpec)</p></li>
<li><p><strong>vector_entry_point</strong>: The location of the vectorized environment to create from</p></li>
</ul>
</dd></dl>
<dl class="py attribute">
<dt class="sig sig-object py" id="gymnasium.envs.registration.registry">
<span class="sig-prename descclassname"><span class="pre">gymnasium.envs.registration.</span></span><span class="sig-name descname"><span class="pre">registry</span></span><a class="headerlink" href="#gymnasium.envs.registration.registry" title="Permalink to this definition">#</a></dt>
<dd><p>The Global registry for gymnasium which is where environment specifications are stored by <a class="reference internal" href="#gymnasium.register" title="gymnasium.register"><code class="xref py py-meth docutils literal notranslate"><span class="pre">gymnasium.register()</span></code></a> and from which <a class="reference internal" href="#gymnasium.make" title="gymnasium.make"><code class="xref py py-meth docutils literal notranslate"><span class="pre">gymnasium.make()</span></code></a> is used to create environments.</p>
</dd></dl>
<dl class="py attribute">
<dt class="sig sig-object py" id="gymnasium.envs.registration.current_namespace">
<span class="sig-prename descclassname"><span class="pre">gymnasium.envs.registration.</span></span><span class="sig-name descname"><span class="pre">current_namespace</span></span><a class="headerlink" href="#gymnasium.envs.registration.current_namespace" title="Permalink to this definition">#</a></dt>
<dd><p>The current namespace when creating or registering environments. This is by default <code class="docutils literal notranslate"><span class="pre">None</span></code> by with <a class="reference internal" href="#gymnasium.envs.registration.namespace" title="gymnasium.envs.registration.namespace"><code class="xref py py-meth docutils literal notranslate"><span class="pre">namespace()</span></code></a> this can be modified to automatically set the environment id namespace.</p>
</dd></dl>
</section>
<section id="additional-functions">
<h2>Additional functions<a class="headerlink" href="#additional-functions" title="Permalink to this heading">#</a></h2>
<dl class="py function">
<dt class="sig sig-object py" id="gymnasium.envs.registration.get_env_id">
<span class="sig-prename descclassname"><span class="pre">gymnasium.envs.registration.</span></span><span class="sig-name descname"><span class="pre">get_env_id</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">ns</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">str</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">name</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">str</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">version</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">int</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">None</span></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">&#x2192;</span> <span class="sig-return-typehint"><span class="pre">str</span></span></span><a class="headerlink" href="#gymnasium.envs.registration.get_env_id" title="Permalink to this definition">#</a></dt>
<dd><p>Get the full env ID given a name and (optional) version and namespace. Inverse of <a class="reference internal" href="#gymnasium.envs.registration.parse_env_id" title="gymnasium.envs.registration.parse_env_id"><code class="xref py py-meth docutils literal notranslate"><span class="pre">parse_env_id()</span></code></a>.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>ns</strong> – The environment namespace</p></li>
<li><p><strong>name</strong> – The environment name</p></li>
<li><p><strong>version</strong> – The environment version</p></li>
</ul>
</dd>
<dt class="field-even">Returns<span class="colon">:</span></dt>
<dd class="field-even"><p><strong>The environment id</strong></p>
</dd>
</dl>
</dd></dl>
<dl class="py function">
<dt class="sig sig-object py" id="gymnasium.envs.registration.parse_env_id">
<span class="sig-prename descclassname"><span class="pre">gymnasium.envs.registration.</span></span><span class="sig-name descname"><span class="pre">parse_env_id</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">env_id</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">str</span></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">&#x2192;</span> <span class="sig-return-typehint"><span class="pre">tuple</span><span class="p"><span class="pre">[</span></span><span class="pre">str</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">None</span><span class="p"><span class="pre">,</span></span><span class="w"> </span><span class="pre">str</span><span class="p"><span class="pre">,</span></span><span class="w"> </span><span class="pre">int</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">None</span><span class="p"><span class="pre">]</span></span></span></span><a class="headerlink" href="#gymnasium.envs.registration.parse_env_id" title="Permalink to this definition">#</a></dt>
<dd><p>Parse environment ID string format - <code class="docutils literal notranslate"><span class="pre">[namespace/](env-name)[-v(version)]</span></code> where the namespace and version are optional.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><p><strong>env_id</strong> – The environment id to parse</p>
</dd>
<dt class="field-even">Returns<span class="colon">:</span></dt>
<dd class="field-even"><p><strong>A tuple of environment namespace, environment name and version number</strong></p>
</dd>
<dt class="field-odd">Raises<span class="colon">:</span></dt>
<dd class="field-odd"><p><strong>Error</strong> – If the environment id is not valid environment regex</p>
</dd>
</dl>
</dd></dl>
<dl class="py function">
<dt class="sig sig-object py" id="gymnasium.envs.registration.find_highest_version">
<span class="sig-prename descclassname"><span class="pre">gymnasium.envs.registration.</span></span><span class="sig-name descname"><span class="pre">find_highest_version</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">ns</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">str</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">name</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">str</span></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">&#x2192;</span> <span class="sig-return-typehint"><span class="pre">int</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">None</span></span></span><a class="headerlink" href="#gymnasium.envs.registration.find_highest_version" title="Permalink to this definition">#</a></dt>
<dd><p>Finds the highest registered version of the environment given the namespace and name in the registry.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>ns</strong> – The environment namespace</p></li>
<li><p><strong>name</strong> – The environment name (id)</p></li>
</ul>
</dd>
<dt class="field-even">Returns<span class="colon">:</span></dt>
<dd class="field-even"><p><strong>The highest version of an environment with matching namespace and name, otherwise ``None`` is returned.</strong></p>
</dd>
</dl>
</dd></dl>
<dl class="py function">
<dt class="sig sig-object py" id="gymnasium.envs.registration.namespace">
<span class="sig-prename descclassname"><span class="pre">gymnasium.envs.registration.</span></span><span class="sig-name descname"><span class="pre">namespace</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">ns</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">str</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#gymnasium.envs.registration.namespace" title="Permalink to this definition">#</a></dt>
<dd><p>Context manager for modifying the current namespace.</p>
</dd></dl>
<dl class="py function">
<dt class="sig sig-object py" id="gymnasium.envs.registration.load_plugin_envs">
<span class="sig-prename descclassname"><span class="pre">gymnasium.envs.registration.</span></span><span class="sig-name descname"><span class="pre">load_plugin_envs</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">entry_point</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">str</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">'gymnasium.envs'</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#gymnasium.envs.registration.load_plugin_envs" title="Permalink to this definition">#</a></dt>
<dd><p>Load modules (plugins) using the gymnasium entry points in order to register external module’s environments on <code class="docutils literal notranslate"><span class="pre">import</span> <span class="pre">gymnasium</span></code>.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><p><strong>entry_point</strong> – The string for the entry point.</p>
</dd>
</dl>
</dd></dl>
</section>
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<ul>
<li><a class="reference internal" href="#">Register and Make</a><ul>
<li><a class="reference internal" href="#gymnasium.make"><code class="docutils literal notranslate"><span class="pre">make()</span></code></a></li>
<li><a class="reference internal" href="#gymnasium.register"><code class="docutils literal notranslate"><span class="pre">register()</span></code></a></li>
<li><a class="reference internal" href="#gymnasium.spec"><code class="docutils literal notranslate"><span class="pre">spec()</span></code></a></li>
<li><a class="reference internal" href="#gymnasium.pprint_registry"><code class="docutils literal notranslate"><span class="pre">pprint_registry()</span></code></a></li>
<li><a class="reference internal" href="#core-variables">Core variables</a><ul>
<li><a class="reference internal" href="#gymnasium.envs.registration.EnvSpec"><code class="docutils literal notranslate"><span class="pre">EnvSpec</span></code></a></li>
<li><a class="reference internal" href="#gymnasium.envs.registration.registry"><code class="docutils literal notranslate"><span class="pre">gymnasium.envs.registration.registry</span></code></a></li>
<li><a class="reference internal" href="#gymnasium.envs.registration.current_namespace"><code class="docutils literal notranslate"><span class="pre">gymnasium.envs.registration.current_namespace</span></code></a></li>
</ul>
</li>
<li><a class="reference internal" href="#additional-functions">Additional functions</a><ul>
<li><a class="reference internal" href="#gymnasium.envs.registration.get_env_id"><code class="docutils literal notranslate"><span class="pre">get_env_id()</span></code></a></li>
<li><a class="reference internal" href="#gymnasium.envs.registration.parse_env_id"><code class="docutils literal notranslate"><span class="pre">parse_env_id()</span></code></a></li>
<li><a class="reference internal" href="#gymnasium.envs.registration.find_highest_version"><code class="docutils literal notranslate"><span class="pre">find_highest_version()</span></code></a></li>
<li><a class="reference internal" href="#gymnasium.envs.registration.namespace"><code class="docutils literal notranslate"><span class="pre">namespace()</span></code></a></li>
<li><a class="reference internal" href="#gymnasium.envs.registration.load_plugin_envs"><code class="docutils literal notranslate"><span class="pre">load_plugin_envs()</span></code></a></li>
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