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<b class="current">Using lists as stacks</b>
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<div><h2 id="a0000000043">6.3.1 Using lists as stacks</h2>
<p>The following example demonstrates the use of a list as a stack; note that the last 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">myList.append("opening wardrobe")</b></tt><br /><tt class="ttfamily">["opening wardrobe"]</tt><br /><tt class="ttfamily">pyxplot> <b class="bfseries">myList.append("opening sock drawer")</b></tt><br /><tt class="ttfamily">["opening wardrobe", "opening sock drawer"]</tt><br /><tt class="ttfamily">pyxplot> <b class="bfseries">myList.append("taking of sock")</b></tt><br /><tt class="ttfamily">["opening wardrobe", "opening sock drawer", "taking of sock"]</tt><br /><tt class="ttfamily">pyxplot> <b class="bfseries">while (myList.len()<img src="images/img-0035.png" alt="$>$" style="vertical-align:0px;
width:12px;
height:11px" class="math gen" />0) { print "Undo "+myList.pop() ; }</b></tt><br /><tt class="ttfamily">Undo taking of sock</tt><br /><tt class="ttfamily">Undo opening sock drawer</tt><br /><tt class="ttfamily">Undo opening wardrobe</tt> </p></div>
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