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<div class="section" id="api-documentation">
<span id="api"></span><h1>API Documentation<a class="headerlink" href="#api-documentation" title="Permalink to this headline">¶</a></h1>
<p>All public API members can (and should) be imported from <tt class="docutils literal"><span class="pre">blinker</span></tt>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">blinker</span> <span class="kn">import</span> <span class="n">ANY</span><span class="p">,</span> <span class="n">signal</span>
</pre></div>
</div>
<div class="section" id="basic-signals">
<h2>Basic Signals<a class="headerlink" href="#basic-signals" title="Permalink to this headline">¶</a></h2>
<dl class="attribute">
<dt id="blinker.base.ANY">
<tt class="descclassname">base.</tt><tt class="descname">ANY</tt><em class="property"> = ANY</em><a class="headerlink" href="#blinker.base.ANY" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="attribute">
<dt id="blinker.base.receiver_connected">
<tt class="descclassname">base.</tt><tt class="descname">receiver_connected</tt><em class="property"> = <blinker.base.Signal object at 0x1021758d0></em><a class="headerlink" href="#blinker.base.receiver_connected" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="class">
<dt id="blinker.base.Signal">
<em class="property">class </em><tt class="descclassname">blinker.base.</tt><tt class="descname">Signal</tt><big>(</big><em>doc=None</em><big>)</big><a class="headerlink" href="#blinker.base.Signal" title="Permalink to this definition">¶</a></dt>
<dd><p>A notification emitter.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>doc</strong> – optional. If provided, will be assigned to the signal’s
__doc__ attribute.</td>
</tr>
</tbody>
</table>
<dl class="attribute">
<dt id="blinker.base.Signal.ANY">
<tt class="descname">ANY</tt><em class="property"> = ANY</em><a class="headerlink" href="#blinker.base.Signal.ANY" title="Permalink to this definition">¶</a></dt>
<dd><p>An <a class="reference internal" href="#blinker.base.ANY" title="blinker.base.ANY"><tt class="xref py py-obj docutils literal"><span class="pre">ANY</span></tt></a> convenience synonym, allows <tt class="docutils literal"><span class="pre">Signal.ANY</span></tt>
without an additional import.</p>
</dd></dl>
<dl class="attribute">
<dt id="blinker.base.Signal.receiver_connected">
<tt class="descname">receiver_connected</tt><a class="headerlink" href="#blinker.base.Signal.receiver_connected" title="Permalink to this definition">¶</a></dt>
<dd><p>Emitted after each <a class="reference internal" href="#blinker.base.Signal.connect" title="blinker.base.Signal.connect"><tt class="xref py py-meth docutils literal"><span class="pre">connect()</span></tt></a>.</p>
<p>The signal sender is the signal instance, and the <a class="reference internal" href="#blinker.base.Signal.connect" title="blinker.base.Signal.connect"><tt class="xref py py-meth docutils literal"><span class="pre">connect()</span></tt></a>
arguments are passed through: <em>receiver</em>, <em>sender</em>, and <em>weak</em>.</p>
<p class="versionadded">
<span class="versionmodified">New in version 1.2.</span></p>
</dd></dl>
<dl class="attribute">
<dt id="blinker.base.Signal.receiver_disconnected">
<tt class="descname">receiver_disconnected</tt><a class="headerlink" href="#blinker.base.Signal.receiver_disconnected" title="Permalink to this definition">¶</a></dt>
<dd><p>Emitted after <a class="reference internal" href="#blinker.base.Signal.disconnect" title="blinker.base.Signal.disconnect"><tt class="xref py py-meth docutils literal"><span class="pre">disconnect()</span></tt></a>.</p>
<p>The sender is the signal instance, and the <a class="reference internal" href="#blinker.base.Signal.disconnect" title="blinker.base.Signal.disconnect"><tt class="xref py py-meth docutils literal"><span class="pre">disconnect()</span></tt></a> arguments
are passed through: <em>receiver</em> and <em>sender</em>.</p>
<p>Note, this signal is emitted <strong>only</strong> when <a class="reference internal" href="#blinker.base.Signal.disconnect" title="blinker.base.Signal.disconnect"><tt class="xref py py-meth docutils literal"><span class="pre">disconnect()</span></tt></a> is
called explicitly.</p>
<p>The disconnect signal can not be emitted by an automatic disconnect
(due to a weakly referenced receiver or sender going out of scope),
as the receiver and/or sender instances are no longer available for
use at the time this signal would be emitted.</p>
<p>An alternative approach is available by subscribing to
<a class="reference internal" href="#blinker.base.receiver_connected" title="blinker.base.receiver_connected"><tt class="xref py py-attr docutils literal"><span class="pre">receiver_connected</span></tt></a> and setting up a custom weakref cleanup
callback on weak receivers and senders.</p>
<p class="versionadded">
<span class="versionmodified">New in version 1.2.</span></p>
</dd></dl>
<dl class="attribute">
<dt id="blinker.base.Signal.receivers">
<tt class="descname">receivers</tt><em class="property"> = None</em><a class="headerlink" href="#blinker.base.Signal.receivers" title="Permalink to this definition">¶</a></dt>
<dd><p>A mapping of connected receivers.</p>
<p>The values of this mapping are not meaningful outside of the
internal <a class="reference internal" href="#blinker.base.Signal" title="blinker.base.Signal"><tt class="xref py py-class docutils literal"><span class="pre">Signal</span></tt></a> implementation, however the boolean value
of the mapping is useful as an extremely efficient check to see if
any receivers are connected to the signal.</p>
</dd></dl>
<dl class="method">
<dt id="blinker.base.Signal.connect">
<tt class="descname">connect</tt><big>(</big><em>receiver</em>, <em>sender=ANY</em>, <em>weak=True</em><big>)</big><a class="headerlink" href="#blinker.base.Signal.connect" title="Permalink to this definition">¶</a></dt>
<dd><p>Connect <em>receiver</em> to signal events sent by <em>sender</em>.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>receiver</strong> – A callable. Will be invoked by <a class="reference internal" href="#blinker.base.Signal.send" title="blinker.base.Signal.send"><tt class="xref py py-meth docutils literal"><span class="pre">send()</span></tt></a> with
<cite>sender=</cite> as a single positional argument and any **kwargs that
were provided to a call to <a class="reference internal" href="#blinker.base.Signal.send" title="blinker.base.Signal.send"><tt class="xref py py-meth docutils literal"><span class="pre">send()</span></tt></a>.</li>
<li><strong>sender</strong> – Any object or <a class="reference internal" href="#blinker.base.ANY" title="blinker.base.ANY"><tt class="xref py py-obj docutils literal"><span class="pre">ANY</span></tt></a>, defaults to <tt class="docutils literal"><span class="pre">ANY</span></tt>.
Restricts notifications delivered to <em>receiver</em> to only those
<a class="reference internal" href="#blinker.base.Signal.send" title="blinker.base.Signal.send"><tt class="xref py py-meth docutils literal"><span class="pre">send()</span></tt></a> emissions sent by <em>sender</em>. If <tt class="docutils literal"><span class="pre">ANY</span></tt>, the receiver
will always be notified. A <em>receiver</em> may be connected to
multiple <em>sender</em> values on the same Signal through multiple calls
to <a class="reference internal" href="#blinker.base.Signal.connect" title="blinker.base.Signal.connect"><tt class="xref py py-meth docutils literal"><span class="pre">connect()</span></tt></a>.</li>
<li><strong>weak</strong> – If true, the Signal will hold a weakref to <em>receiver</em>
and automatically disconnect when <em>receiver</em> goes out of scope or
is garbage collected. Defaults to True.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="blinker.base.Signal.connect_via">
<tt class="descname">connect_via</tt><big>(</big><em>sender</em>, <em>weak=False</em><big>)</big><a class="headerlink" href="#blinker.base.Signal.connect_via" title="Permalink to this definition">¶</a></dt>
<dd><p>Connect the decorated function as a receiver for <em>sender</em>.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>sender</strong> – Any object or <a class="reference internal" href="#blinker.base.ANY" title="blinker.base.ANY"><tt class="xref py py-obj docutils literal"><span class="pre">ANY</span></tt></a>. The decorated function
will only receive <a class="reference internal" href="#blinker.base.Signal.send" title="blinker.base.Signal.send"><tt class="xref py py-meth docutils literal"><span class="pre">send()</span></tt></a> emissions sent by <em>sender</em>. If
<tt class="docutils literal"><span class="pre">ANY</span></tt>, the receiver will always be notified. A function may be
decorated multiple times with differing <em>sender</em> values.</li>
<li><strong>weak</strong> – If true, the Signal will hold a weakref to the
decorated function and automatically disconnect when <em>receiver</em>
goes out of scope or is garbage collected. Unlike
<a class="reference internal" href="#blinker.base.Signal.connect" title="blinker.base.Signal.connect"><tt class="xref py py-meth docutils literal"><span class="pre">connect()</span></tt></a>, this defaults to False.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<dl class="docutils">
<dt>The decorated function will be invoked by <a class="reference internal" href="#blinker.base.Signal.send" title="blinker.base.Signal.send"><tt class="xref py py-meth docutils literal"><span class="pre">send()</span></tt></a> with</dt>
<dd><cite>sender=</cite> as a single positional argument and any **kwargs that
were provided to the call to <a class="reference internal" href="#blinker.base.Signal.send" title="blinker.base.Signal.send"><tt class="xref py py-meth docutils literal"><span class="pre">send()</span></tt></a>.</dd>
</dl>
<p class="versionadded">
<span class="versionmodified">New in version 1.1.</span></p>
</dd></dl>
<dl class="method">
<dt id="blinker.base.Signal.connected_to">
<tt class="descname">connected_to</tt><big>(</big><em>*args</em>, <em>**kwds</em><big>)</big><a class="headerlink" href="#blinker.base.Signal.connected_to" title="Permalink to this definition">¶</a></dt>
<dd><p>Execute a block with the signal temporarily connected to <em>receiver</em>.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>receiver</strong> – a receiver callable</li>
<li><strong>sender</strong> – optional, a sender to filter on</li>
</ul>
</td>
</tr>
</tbody>
</table>
<p>This is a context manager for use in the <tt class="docutils literal"><span class="pre">with</span></tt> statement. It can
be useful in unit tests. <em>receiver</em> is connected to the signal for
the duration of the <tt class="docutils literal"><span class="pre">with</span></tt> block, and will be disconnected
automatically when exiting the block:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">with</span> <span class="n">on_ready</span><span class="o">.</span><span class="n">connected_to</span><span class="p">(</span><span class="n">receiver</span><span class="p">):</span>
<span class="c"># do stuff</span>
<span class="n">on_ready</span><span class="o">.</span><span class="n">send</span><span class="p">(</span><span class="mi">123</span><span class="p">)</span>
</pre></div>
</div>
<p class="versionadded">
<span class="versionmodified">New in version 1.1.</span></p>
</dd></dl>
<dl class="method">
<dt id="blinker.base.Signal.disconnect">
<tt class="descname">disconnect</tt><big>(</big><em>receiver</em>, <em>sender=ANY</em><big>)</big><a class="headerlink" href="#blinker.base.Signal.disconnect" title="Permalink to this definition">¶</a></dt>
<dd><p>Disconnect <em>receiver</em> from this signal’s events.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>receiver</strong> – a previously <a class="reference internal" href="#blinker.base.Signal.connect" title="blinker.base.Signal.connect"><tt class="xref py py-meth docutils literal"><span class="pre">connected</span></tt></a> callable</li>
<li><strong>sender</strong> – a specific sender to disconnect from, or <a class="reference internal" href="#blinker.base.ANY" title="blinker.base.ANY"><tt class="xref py py-obj docutils literal"><span class="pre">ANY</span></tt></a>
to disconnect from all senders. Defaults to <tt class="docutils literal"><span class="pre">ANY</span></tt>.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="blinker.base.Signal.has_receivers_for">
<tt class="descname">has_receivers_for</tt><big>(</big><em>sender</em><big>)</big><a class="headerlink" href="#blinker.base.Signal.has_receivers_for" title="Permalink to this definition">¶</a></dt>
<dd><p>True if there is probably a receiver for <em>sender</em>.</p>
<p>Performs an optimistic check only. Does not guarantee that all
weakly referenced receivers are still alive. See
<a class="reference internal" href="#blinker.base.Signal.receivers_for" title="blinker.base.Signal.receivers_for"><tt class="xref py py-meth docutils literal"><span class="pre">receivers_for()</span></tt></a> for a stronger search.</p>
</dd></dl>
<dl class="method">
<dt id="blinker.base.Signal.receivers_for">
<tt class="descname">receivers_for</tt><big>(</big><em>sender</em><big>)</big><a class="headerlink" href="#blinker.base.Signal.receivers_for" title="Permalink to this definition">¶</a></dt>
<dd><p>Iterate all live receivers listening for <em>sender</em>.</p>
</dd></dl>
<dl class="method">
<dt id="blinker.base.Signal.send">
<tt class="descname">send</tt><big>(</big><em>*sender</em>, <em>**kwargs</em><big>)</big><a class="headerlink" href="#blinker.base.Signal.send" title="Permalink to this definition">¶</a></dt>
<dd><p>Emit this signal on behalf of <em>sender</em>, passing on **kwargs.</p>
<p>Returns a list of 2-tuples, pairing receivers with their return
value. The ordering of receiver notification is undefined.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>*sender</strong> – Any object or <tt class="docutils literal"><span class="pre">None</span></tt>. If omitted, synonymous
with <tt class="docutils literal"><span class="pre">None</span></tt>. Only accepts one positional argument.</li>
<li><strong>**kwargs</strong> – Data to be sent to receivers.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="blinker.base.Signal.temporarily_connected_to">
<tt class="descname">temporarily_connected_to</tt><big>(</big><em>receiver</em>, <em>sender=ANY</em><big>)</big><a class="headerlink" href="#blinker.base.Signal.temporarily_connected_to" title="Permalink to this definition">¶</a></dt>
<dd><p>An alias for <a class="reference internal" href="#blinker.base.Signal.connected_to" title="blinker.base.Signal.connected_to"><tt class="xref py py-meth docutils literal"><span class="pre">connected_to()</span></tt></a>.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>receiver</strong> – a receiver callable</li>
<li><strong>sender</strong> – optional, a sender to filter on</li>
</ul>
</td>
</tr>
</tbody>
</table>
<p class="versionadded">
<span class="versionmodified">New in version 0.9.</span></p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 1.1: </span>Renamed to <a class="reference internal" href="#blinker.base.Signal.connected_to" title="blinker.base.Signal.connected_to"><tt class="xref py py-meth docutils literal"><span class="pre">connected_to()</span></tt></a>. <tt class="docutils literal"><span class="pre">temporarily_connected_to</span></tt>
was deprecated in 1.2 and removed in a subsequent version.</p>
</dd></dl>
</dd></dl>
</div>
<div class="section" id="named-signals">
<h2>Named Signals<a class="headerlink" href="#named-signals" title="Permalink to this headline">¶</a></h2>
<dl class="function">
<dt id="blinker.base.signal">
<tt class="descclassname">blinker.base.</tt><tt class="descname">signal</tt><big>(</big><em>name</em>, <em>doc=None</em><big>)</big><a class="headerlink" href="#blinker.base.signal" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the <a class="reference internal" href="#blinker.base.NamedSignal" title="blinker.base.NamedSignal"><tt class="xref py py-class docutils literal"><span class="pre">NamedSignal</span></tt></a> <em>name</em>, creating it if required.</p>
<p>Repeated calls to this function will return the same signal object.
Signals are created in a global <a class="reference internal" href="#blinker.base.Namespace" title="blinker.base.Namespace"><tt class="xref py py-class docutils literal"><span class="pre">Namespace</span></tt></a>.</p>
</dd></dl>
<dl class="class">
<dt id="blinker.base.NamedSignal">
<em class="property">class </em><tt class="descclassname">blinker.base.</tt><tt class="descname">NamedSignal</tt><big>(</big><em>name</em>, <em>doc=None</em><big>)</big><a class="headerlink" href="#blinker.base.NamedSignal" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="#blinker.base.Signal" title="blinker.base.Signal"><tt class="xref py py-class docutils literal"><span class="pre">blinker.base.Signal</span></tt></a></p>
<p>A named generic notification emitter.</p>
<dl class="attribute">
<dt id="blinker.base.NamedSignal.name">
<tt class="descname">name</tt><em class="property"> = None</em><a class="headerlink" href="#blinker.base.NamedSignal.name" title="Permalink to this definition">¶</a></dt>
<dd><p>The name of this signal.</p>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="blinker.base.Namespace">
<em class="property">class </em><tt class="descclassname">blinker.base.</tt><tt class="descname">Namespace</tt><big>(</big><em>*args</em>, <em>**kw</em><big>)</big><a class="headerlink" href="#blinker.base.Namespace" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <tt class="xref py py-class docutils literal"><span class="pre">weakref.WeakValueDictionary</span></tt></p>
<p>A mapping of signal names to signals.</p>
<dl class="method">
<dt id="blinker.base.Namespace.signal">
<tt class="descname">signal</tt><big>(</big><em>name</em>, <em>doc=None</em><big>)</big><a class="headerlink" href="#blinker.base.Namespace.signal" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the <a class="reference internal" href="#blinker.base.NamedSignal" title="blinker.base.NamedSignal"><tt class="xref py py-class docutils literal"><span class="pre">NamedSignal</span></tt></a> <em>name</em>, creating it if required.</p>
<p>Repeated calls to this function will return the same signal object.</p>
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