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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="tex2html5314" HREF="page359.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html5312" HREF="page356.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html5308" HREF="page357.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html5316" HREF="page611.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="../icons/index_motif.gif"></A> <BR><HR><H3><A NAME="SECTION0011222000000000000000"><tt>__init__</tt> and <tt>purge</tt> Methods</A></H3><P>Program&nbsp;<A HREF="page356.html#progbinaryHeapa"><IMG  ALIGN=BOTTOM ALT="gif" SRC="../icons/cross_ref_motif.gif"></A> defines the <tt>BinaryHeap</tt> <tt>__init__</tt> method.In addition to <tt>self</tt>,the <tt>__init__</tt> method takes a single argument of type <tt>int</tt> whichspecifies the maximum capacity of the binary heap.The <tt>__init__</tt> method allocates an array of the specified sizeand sets the base index of the array to one.This is done because array position zero will not be used.The running time of the <tt>__init__</tt> method is <I>O</I>(<I>n</I>),where <I>n</I> is the maximum length of the priority queue.<P>The purpose of the <tt>purge</tt> method is to make the priority queue empty.The <tt>purge</tt> method assigns the value <tt>None</tt>to the array positions one-by-one.Clearly the worst-case running time for the <tt>purge</tt> method is <I>O</I>(<I>n</I>),where <I>n</I> is the maximum length of the priority queue.<P><HR><A NAME="tex2html5314" HREF="page359.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html5312" HREF="page356.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html5308" HREF="page357.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html5316" 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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