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<HTML><HEAD><TITLE>__init__ and purge Methods</TITLE></HEAD><BODY bgcolor="#FFFFFF"> <a href="../index.html" target="_top"><img src="../icons/usins.gif" alt="Logo" align=right></a><b>Data Structures and Algorithms with Object-Oriented Design Patterns in Python</b><br><A NAME="tex2html2983" HREF="page155.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html2981" HREF="page152.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html2975" HREF="page153.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html2985" HREF="page611.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="../icons/index_motif.gif"></A> <BR><HR><H3><A NAME="SECTION006222000000000000000"><tt>__init__</tt> and <tt>purge</tt> Methods</A></H3><P>Program&nbsp;<A HREF="page152.html#progqueueAsLinkedLista"><IMG  ALIGN=BOTTOM ALT="gif" SRC="../icons/cross_ref_motif.gif"></A> defines the <tt>QueueAsLinkedList</tt><tt>__init__</tt> and <tt>purge</tt> methods.In the case of the linked list implementation,it is not necessary to preallocate storage.The <tt>__init__</tt> method simply initializesthe <tt>_list</tt> object as an empty list.The running time of the <tt>__init__</tt> method is <I>O</I>(1).<P>The <tt>purge</tt> methodempties the queue by invoking the <tt>purge</tt> methodprovided by the <tt>LinkedList</tt> classand then sets the <tt>_count</tt> instance attribute to zero.Since a linked-list can be purged in constant time,the total running time for the <tt>purge</tt> method is <I>O</I>(1).<P><HR><A NAME="tex2html2983" HREF="page155.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html2981" HREF="page152.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html2975" HREF="page153.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html2985" HREF="page611.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="../icons/index_motif.gif"></A> <P><ADDRESS><img src="../icons/bruno.gif" alt="Bruno" align=right><a href="../copyright.html">Copyright &#169; 2003</a> by <a href="../signature.html">Bruno R. Preiss, P.Eng.</a>  All rights reserved.</ADDRESS></BODY></HTML>

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