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<li><a class="reference internal" href="#"><code class="xref py py-mod docutils literal notranslate"><span class="pre">sched</span></code> — Event scheduler</a><ul>
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<section id="module-sched">
<span id="sched-event-scheduler"></span><h1><code class="xref py py-mod docutils literal notranslate"><span class="pre">sched</span></code> — Event scheduler<a class="headerlink" href="#module-sched" title="Link to this heading"></a></h1>
<p><strong>Source code:</strong> <a class="extlink-source reference external" href="https://github.com/python/cpython/tree/3.13/Lib/sched.py">Lib/sched.py</a></p>
<hr class="docutils" id="index-0" />
<p>The <a class="reference internal" href="#module-sched" title="sched: General purpose event scheduler."><code class="xref py py-mod docutils literal notranslate"><span class="pre">sched</span></code></a> module defines a class which implements a general purpose event
scheduler:</p>
<dl class="py class">
<dt class="sig sig-object py" id="sched.scheduler">
<em class="property"><span class="k"><span class="pre">class</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">sched.</span></span><span class="sig-name descname"><span class="pre">scheduler</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">timefunc</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">time.monotonic</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">delayfunc</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">time.sleep</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#sched.scheduler" title="Link to this definition"></a></dt>
<dd><p>The <a class="reference internal" href="#sched.scheduler" title="sched.scheduler"><code class="xref py py-class docutils literal notranslate"><span class="pre">scheduler</span></code></a> class defines a generic interface to scheduling events.
It needs two functions to actually deal with the “outside world” — <em>timefunc</em>
should be callable without arguments, and return a number (the “time”, in any
units whatsoever). The <em>delayfunc</em> function should be callable with one
argument, compatible with the output of <em>timefunc</em>, and should delay that many
time units. <em>delayfunc</em> will also be called with the argument <code class="docutils literal notranslate"><span class="pre">0</span></code> after each
event is run to allow other threads an opportunity to run in multi-threaded
applications.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.3: </span><em>timefunc</em> and <em>delayfunc</em> parameters are optional.</p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.3: </span><a class="reference internal" href="#sched.scheduler" title="sched.scheduler"><code class="xref py py-class docutils literal notranslate"><span class="pre">scheduler</span></code></a> class can be safely used in multi-threaded
environments.</p>
</div>
</dd></dl>
<p>Example:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span><span class="w"> </span><span class="nn">sched</span><span class="o">,</span><span class="w"> </span><span class="nn">time</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">s</span> <span class="o">=</span> <span class="n">sched</span><span class="o">.</span><span class="n">scheduler</span><span class="p">(</span><span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">,</span> <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">def</span><span class="w"> </span><span class="nf">print_time</span><span class="p">(</span><span class="n">a</span><span class="o">=</span><span class="s1">&#39;default&#39;</span><span class="p">):</span>
<span class="gp">... </span> <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;From print_time&quot;</span><span class="p">,</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">(),</span> <span class="n">a</span><span class="p">)</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">def</span><span class="w"> </span><span class="nf">print_some_times</span><span class="p">():</span>
<span class="gp">... </span> <span class="nb">print</span><span class="p">(</span><span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">())</span>
<span class="gp">... </span> <span class="n">s</span><span class="o">.</span><span class="n">enter</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">print_time</span><span class="p">)</span>
<span class="gp">... </span> <span class="n">s</span><span class="o">.</span><span class="n">enter</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="n">print_time</span><span class="p">,</span> <span class="n">argument</span><span class="o">=</span><span class="p">(</span><span class="s1">&#39;positional&#39;</span><span class="p">,))</span>
<span class="gp">... </span> <span class="c1"># despite having higher priority, &#39;keyword&#39; runs after &#39;positional&#39; as enter() is relative</span>
<span class="gp">... </span> <span class="n">s</span><span class="o">.</span><span class="n">enter</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">print_time</span><span class="p">,</span> <span class="n">kwargs</span><span class="o">=</span><span class="p">{</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="s1">&#39;keyword&#39;</span><span class="p">})</span>
<span class="gp">... </span> <span class="n">s</span><span class="o">.</span><span class="n">enterabs</span><span class="p">(</span><span class="mi">1_650_000_000</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="n">print_time</span><span class="p">,</span> <span class="n">argument</span><span class="o">=</span><span class="p">(</span><span class="s2">&quot;first enterabs&quot;</span><span class="p">,))</span>
<span class="gp">... </span> <span class="n">s</span><span class="o">.</span><span class="n">enterabs</span><span class="p">(</span><span class="mi">1_650_000_000</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="n">print_time</span><span class="p">,</span> <span class="n">argument</span><span class="o">=</span><span class="p">(</span><span class="s2">&quot;second enterabs&quot;</span><span class="p">,))</span>
<span class="gp">... </span> <span class="n">s</span><span class="o">.</span><span class="n">run</span><span class="p">()</span>
<span class="gp">... </span> <span class="nb">print</span><span class="p">(</span><span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">())</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">print_some_times</span><span class="p">()</span>
<span class="go">1652342830.3640375</span>
<span class="go">From print_time 1652342830.3642538 second enterabs</span>
<span class="go">From print_time 1652342830.3643398 first enterabs</span>
<span class="go">From print_time 1652342835.3694863 positional</span>
<span class="go">From print_time 1652342835.3696074 keyword</span>
<span class="go">From print_time 1652342840.369612 default</span>
<span class="go">1652342840.3697174</span>
</pre></div>
</div>
<section id="scheduler-objects">
<span id="id1"></span><h2>Scheduler Objects<a class="headerlink" href="#scheduler-objects" title="Link to this heading"></a></h2>
<p><a class="reference internal" href="#sched.scheduler" title="sched.scheduler"><code class="xref py py-class docutils literal notranslate"><span class="pre">scheduler</span></code></a> instances have the following methods and attributes:</p>
<dl class="py method">
<dt class="sig sig-object py" id="sched.scheduler.enterabs">
<span class="sig-prename descclassname"><span class="pre">scheduler.</span></span><span class="sig-name descname"><span class="pre">enterabs</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">time</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">priority</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">action</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">argument</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">()</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">kwargs</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">{}</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#sched.scheduler.enterabs" title="Link to this definition"></a></dt>
<dd><p>Schedule a new event. The <em>time</em> argument should be a numeric type compatible
with the return value of the <em>timefunc</em> function passed to the constructor.
Events scheduled for the same <em>time</em> will be executed in the order of their
<em>priority</em>. A lower number represents a higher priority.</p>
<p>Executing the event means executing <code class="docutils literal notranslate"><span class="pre">action(*argument,</span> <span class="pre">**kwargs)</span></code>.
<em>argument</em> is a sequence holding the positional arguments for <em>action</em>.
<em>kwargs</em> is a dictionary holding the keyword arguments for <em>action</em>.</p>
<p>Return value is an event which may be used for later cancellation of the event
(see <a class="reference internal" href="#sched.scheduler.cancel" title="sched.scheduler.cancel"><code class="xref py py-meth docutils literal notranslate"><span class="pre">cancel()</span></code></a>).</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.3: </span><em>argument</em> parameter is optional.</p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.3: </span><em>kwargs</em> parameter was added.</p>
</div>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="sched.scheduler.enter">
<span class="sig-prename descclassname"><span class="pre">scheduler.</span></span><span class="sig-name descname"><span class="pre">enter</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">delay</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">priority</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">action</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">argument</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">()</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">kwargs</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">{}</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#sched.scheduler.enter" title="Link to this definition"></a></dt>
<dd><p>Schedule an event for <em>delay</em> more time units. Other than the relative time, the
other arguments, the effect and the return value are the same as those for
<a class="reference internal" href="#sched.scheduler.enterabs" title="sched.scheduler.enterabs"><code class="xref py py-meth docutils literal notranslate"><span class="pre">enterabs()</span></code></a>.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.3: </span><em>argument</em> parameter is optional.</p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.3: </span><em>kwargs</em> parameter was added.</p>
</div>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="sched.scheduler.cancel">
<span class="sig-prename descclassname"><span class="pre">scheduler.</span></span><span class="sig-name descname"><span class="pre">cancel</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">event</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#sched.scheduler.cancel" title="Link to this definition"></a></dt>
<dd><p>Remove the event from the queue. If <em>event</em> is not an event currently in the
queue, this method will raise a <a class="reference internal" href="exceptions.html#ValueError" title="ValueError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code></a>.</p>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="sched.scheduler.empty">
<span class="sig-prename descclassname"><span class="pre">scheduler.</span></span><span class="sig-name descname"><span class="pre">empty</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#sched.scheduler.empty" title="Link to this definition"></a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the event queue is empty.</p>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="sched.scheduler.run">
<span class="sig-prename descclassname"><span class="pre">scheduler.</span></span><span class="sig-name descname"><span class="pre">run</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">blocking</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">True</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#sched.scheduler.run" title="Link to this definition"></a></dt>
<dd><p>Run all scheduled events. This method will wait (using the <em>delayfunc</em>
function passed to the constructor) for the next event, then execute it and so
on until there are no more scheduled events.</p>
<p>If <em>blocking</em> is false executes the scheduled events due to expire soonest
(if any) and then return the deadline of the next scheduled call in the
scheduler (if any).</p>
<p>Either <em>action</em> or <em>delayfunc</em> can raise an exception. In either case, the
scheduler will maintain a consistent state and propagate the exception. If an
exception is raised by <em>action</em>, the event will not be attempted in future calls
to <a class="reference internal" href="#sched.scheduler.run" title="sched.scheduler.run"><code class="xref py py-meth docutils literal notranslate"><span class="pre">run()</span></code></a>.</p>
<p>If a sequence of events takes longer to run than the time available before the
next event, the scheduler will simply fall behind. No events will be dropped;
the calling code is responsible for canceling events which are no longer
pertinent.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.3: </span><em>blocking</em> parameter was added.</p>
</div>
</dd></dl>
<dl class="py attribute">
<dt class="sig sig-object py" id="sched.scheduler.queue">
<span class="sig-prename descclassname"><span class="pre">scheduler.</span></span><span class="sig-name descname"><span class="pre">queue</span></span><a class="headerlink" href="#sched.scheduler.queue" title="Link to this definition"></a></dt>
<dd><p>Read-only attribute returning a list of upcoming events in the order they
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