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<div><h2 id="a0000000044">6.3.2 Using lists as buffers</h2>
<p>The following example demonstrates the use of a list as a buffer in which the first item added to the stack is the first one to be popped: </p><p> <tt class="ttfamily">pyxplot> <b class="bfseries">myList = []</b></tt><br /><tt class="ttfamily">pyxplot> <b class="bfseries">for (i=1; i<img src="images/img-0046.png" alt="$<$" style="vertical-align:0px;
width:12px;
height:11px" class="math gen" />12; i++)</b></tt><br /><tt class="ttfamily">pyxplot> <b class="bfseries"> {</b></tt><br /><tt class="ttfamily">pyxplot> <b class="bfseries"> if prime(i) { call myList.append(i) ; }</b></tt><br /><tt class="ttfamily">pyxplot> <b class="bfseries"> }</b></tt><br /><tt class="ttfamily">pyxplot> <b class="bfseries">while (myList) { print myList.pop(0) ; }</b></tt><br /><tt class="ttfamily">2</tt><br /><tt class="ttfamily">3</tt><br /><tt class="ttfamily">5</tt><br /><tt class="ttfamily">7</tt><br /><tt class="ttfamily">11</tt> </p><p>The function <tt class="tt">prime(x)</tt> returns true if <tt class="tt">x</tt> is a prime number, and false otherwise. In the final line, we make use of the fact that a list tests true if it contains any items, or false if it is empty. </p></div>
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