"pre">digit</span></code></a>
</pre>
<p>In less formal terms, the replacement field can start with an <em>arg_id</em>
that specifies the argument whose value is to be formatted and inserted into
the output instead of the replacement field.
The <em>arg_id</em> is optionally followed by a <em>format_spec</em>, which is preceded by a
colon <code class="docutils literal notranslate"><span class="pre">':'</span></code>.  These specify a non-default format for the replacement value.</p>
<p>See also the <a class="