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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="tex2html2757" HREF="page135.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html2755" HREF="page132.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html2749" HREF="page133.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html2759" HREF="page611.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="../icons/index_motif.gif"></A> <BR><HR><H3><A NAME="SECTION006112000000000000000"><tt>__init__</tt> and <tt>purge</tt> Methods</A></H3><P>The definitions of the <tt>StackAsArray</tt> <tt>__init__</tt>and <tt>purge</tt> methods are given in Program&nbsp;<A HREF="page132.html#progstackAsArraya"><IMG  ALIGN=BOTTOM ALT="gif" SRC="../icons/cross_ref_motif.gif"></A>.In addition to <tt>self</tt>,the <tt>__init__</tt> method takes a single parameter, <tt>size</tt>,which specifies the maximum number of items that can be stored in the stack.The variable <tt>_array</tt> is initialized to be an array of length <tt>size</tt>.The <tt>__init__</tt> method requires <I>O</I>(<I>n</I>) time to construct the array,where  <IMG WIDTH=64 HEIGHT=10 ALIGN=BOTTOM ALT="tex2html_wrap_inline60687" SRC="img662.gif"  >.<P>The purpose of the <tt>purge</tt> method is to remove allthe contents of a container.In this case, the objects in the stack occupy the first <tt>_count</tt>positions of the array.To empty the stack,the <tt>purge</tt> method simply assigns <tt>None</tt>to the first <tt>_count</tt> positions of the array.Clearly, the running time for the <tt>purge</tt> method is <I>O</I>(<I>n</I>),where  <IMG WIDTH=72 HEIGHT=9 ALIGN=BOTTOM ALT="tex2html_wrap_inline60691" SRC="img663.gif"  >.<P><HR><A NAME="tex2html2757" HREF="page135.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html2755" HREF="page132.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html2749" HREF="page133.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html2759" 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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