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26 lines
2.4 KiB
26 lines
2.4 KiB
<div class="section" id="the-nonlocal-statement">
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<span id="nonlocal"></span><h2>The <a class="reference internal" href="#nonlocal"><tt class="xref std std-keyword docutils literal"><span class="pre">nonlocal</span></tt></a> statement</h2>
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<pre id="index-41">
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<strong id="grammar-token-nonlocal_stmt">nonlocal_stmt</strong> ::= "nonlocal" <a class="reference internal" href="lexical_analysis.html#grammar-token-identifier"><tt class="xref docutils literal"><span class="pre">identifier</span></tt></a> ("," <a class="reference internal" href="lexical_analysis.html#grammar-token-identifier"><tt class="xref docutils literal"><span class="pre">identifier</span></tt></a>)*
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</pre>
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<p>The <a class="reference internal" href="#nonlocal"><tt class="xref std std-keyword docutils literal"><span class="pre">nonlocal</span></tt></a> statement causes the listed identifiers to refer to
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previously bound variables in the nearest enclosing scope excluding globals.
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This is important because the default behavior for binding is to search the
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local namespace first. The statement allows encapsulated code to rebind
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variables outside of the local scope besides the global (module) scope.</p>
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<p>Names listed in a <a class="reference internal" href="#nonlocal"><tt class="xref std std-keyword docutils literal"><span class="pre">nonlocal</span></tt></a> statement, unlike those listed in a
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<a class="reference internal" href="#global"><tt class="xref std std-keyword docutils literal"><span class="pre">global</span></tt></a> statement, must refer to pre-existing bindings in an
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enclosing scope (the scope in which a new binding should be created cannot
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be determined unambiguously).</p>
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<p>Names listed in a <a class="reference internal" href="#nonlocal"><tt class="xref std std-keyword docutils literal"><span class="pre">nonlocal</span></tt></a> statement must not collide with
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pre-existing bindings in the local scope.</p>
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<div class="admonition seealso">
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<p class="first admonition-title">See also</p>
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<dl class="last docutils">
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<dt><span class="target" id="index-42"></span><a class="pep reference external" href="http://www.python.org/dev/peps/pep-3104"><strong>PEP 3104</strong></a> - Access to Names in Outer Scopes</dt>
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<dd>The specification for the <a class="reference internal" href="#nonlocal"><tt class="xref std std-keyword docutils literal"><span class="pre">nonlocal</span></tt></a> statement.</dd>
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</dl>
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</div>
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</div>
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</div>
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