twisted.flow.stage.Map.html [plain text]
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<a href="twisted.html">Package twisted</a> ::
<a href="twisted.flow.html">Package flow</a> ::
<a href="twisted.flow.stage.html">Module stage</a> ::
Class Map
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<h2 class="class">Class Map</h2>
<pre class="base-tree">
<a href="twisted.flow.base.Instruction.html"><code>Instruction</code></a> --+
|
<a href="twisted.flow.base.Stage.html"><code>Stage</code></a> --+
|
<b>Map</b>
</pre><br />
<dl><dt><b>Known Subclasses:</b></dt>
<dd>
<a href="twisted.flow.stage.Zip.html"><code>Zip</code></a></dd></dl>
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<pre class="literalblock">
flow equivalent to map: Map(function, stage, ... )
Apply a function to every item yielded and yield the results.
If additional stages are passed, the function must take that
many arguments and is applied to the items of all lists in
parallel. If a list is shorter than another, it is assumed
to be extended with None items. If the function is None,
the identity function is assumed; if there are multiple list
arguments, Map stage returns a sequence consisting of tuples
containing the corresponding items from all lists.
def fn(val):
return val + 10
source = flow.Map(fn,range(4))
printFlow(source)
</pre>
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<td><code><a name="__init__"></a><span class="summary-sig"><span class="summary-sig-name">__init__</span>(<span class=summary-sig-arg>self</span>,
<span class=summary-sig-arg>func</span>,
<span class=summary-sig-arg>stage</span>,
<span class="summary-sig-vararg">*stages</span>)</span></code>
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<td><code><span class="summary-sig"><a href="twisted.flow.stage.Map.html#_yield" class="summary-sig-name"><code>_yield</code></a>(<span class=summary-sig-arg>self</span>)</span></code>
<br />
executed during a yield statement by previous stage</td></tr>
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<th colspan="2"> Inherited from Stage</th></tr>
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<td><code><span class="summary-sig"><a href="twisted.flow.base.Stage.html#__iter__" class="summary-sig-name"><code>__iter__</code></a>(<span class=summary-sig-arg>self</span>)</span></code>
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<td><code><span class="summary-sig"><a href="twisted.flow.base.Stage.html#next" class="summary-sig-name"><code>next</code></a>(<span class=summary-sig-arg>self</span>)</span></code>
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return current result</td></tr>
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<a name="_yield"></a>
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<h3><span class="sig"><span class="sig-name">_yield</span>(<span class=sig-arg>self</span>)</span>
</h3>
<p>executed during a yield statement by previous stage</p>
This method is private within the scope of the flow module, it is
used by one stage in the flow to ask a subsequent stage to produce its
value. The result of the yield is then stored in self.result and is an
instance of Failure if a problem occurred.
<dl><dt></dt><dd>
<dl><dt><b>Overrides:</b></dt>
<dd><a href="twisted.flow.base.Stage.html#_yield"><code>twisted.flow.base.Stage._yield</code></a> <i>(inherited documentation)</i>
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