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<title>4.1.2.1. Python Function Whitespace</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="section" title="4.1.2.1. Python Function Whitespace">
<div class="titlepage"><div><div><h4 class="title">
<a name="migration-1.3-python-function-whitespace"></a>4.1.2.1. Python Function Whitespace</h4></div></div></div>
<p>
                All Python functions must now use four spaces for indentation. 
                Previously, an inconsistent mix of spaces and tabs existed,
                which made extending these functions using 
                <code class="filename">_append</code> or <code class="filename">_prepend</code>
                complicated given that Python treats whitespace as 
                syntactically significant. 
                If you are defining or extending any Python functions (e.g.
                <code class="filename">populate_packages</code>, <code class="filename">do_unpack</code>,
                <code class="filename">do_patch</code> and so forth) in custom recipes
                or classes, you need to ensure you are using consistent 
                four-space indentation.
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