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<div class="section" id="bluesky-plans-lazily-stage-wrapper">
<h1>bluesky.plans.lazily_stage_wrapper<a class="headerlink" href="#bluesky-plans-lazily-stage-wrapper" title="Permalink to this headline">¶</a></h1>
<dl class="function">
<dt id="bluesky.plans.lazily_stage_wrapper">
<code class="descclassname">bluesky.plans.</code><code class="descname">lazily_stage_wrapper</code><span class="sig-paren">(</span><em>plan</em><span class="sig-paren">)</span><a class="headerlink" href="#bluesky.plans.lazily_stage_wrapper" title="Permalink to this definition">¶</a></dt>
<dd><p>This is a preprocessor that inserts ‘stage’ messages and appends ‘unstage’.</p>
<p>The first time an object is seen in <cite>plan</cite>, it is staged. To avoid
redundant staging we actually stage the object’s ultimate parent, pointed
to be its <cite>root</cite> property.</p>
<p>At the end, in a <cite>finally</cite> block, an ‘unstage’ Message issued for every
‘stage’ Message.</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>plan</strong> (<em>iterable or iterator</em>) – a generator, list, or similar containing <cite>Msg</cite> objects</td>
</tr>
<tr class="field-even field"><th class="field-name">Yields:</th><td class="field-body"><strong>msg</strong> (<em>Msg</em>) – messages from plan with ‘stage’ messages inserted and ‘unstage’
messages appended</td>
</tr>
</tbody>
</table>
<div class="admonition seealso">
<p class="first admonition-title">See also</p>
<p class="last"><cite>bluesky.plans.stage_context</cite></p>
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