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📁 Data Structures And Algorithms With Object-Oriented Design Patterns In Python (2003) source code and
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<HTML><HEAD><TITLE>Implementing B-Trees</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="tex2html5121" HREF="page342.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html5119" HREF="page340.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html5113" HREF="page340.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html5123" HREF="page611.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="../icons/index_motif.gif"></A> <BR><HR><H2><A NAME="SECTION0010710000000000000000">Implementing B-Trees</A></H2><P>Having already implemented the <I>M</I>-way search tree class, <tt>MWayTree</tt>,we can make use of much the existing code to implement a B-tree class.Program&nbsp;<A HREF="page341.html#progbTreea"><IMG  ALIGN=BOTTOM ALT="gif" SRC="../icons/cross_ref_motif.gif"></A> introduces the <tt>BTree</tt> classwhich extends the class <tt>MWayTree</tt> classintroduced in Program&nbsp;<A HREF="page332.html#progmWayTreea"><IMG  ALIGN=BOTTOM ALT="gif" SRC="../icons/cross_ref_motif.gif"></A>With the exception of the two methods which modify the tree,<tt>insert</tt> and <tt>withdraw</tt>,the <tt>BTree</tt> class inherits all itsfunctionality from the <I>M</I>-way tree class.Of course, the <tt>insert</tt> and <tt>withdraw</tt> methodsneed to be redefined in order to ensure that every time tree is modifiedthe tree which results is a B-tree.<P><P><A NAME="21333">&#160;</A><A NAME="progbTreea">&#160;</A> <IMG WIDTH=575 HEIGHT=218 ALIGN=BOTTOM ALT="program21260" SRC="img1337.gif"  ><BR><STRONG>Program:</STRONG> <tt>BTree</tt> class <tt>__init__</tt> and <tt>attachSubtree</tt> methods.<BR><P><BR> <HR><UL> <LI> <A NAME="tex2html5124" HREF="page342.html#SECTION0010711000000000000000">Instance Attributes</A><LI> <A NAME="tex2html5125" HREF="page343.html#SECTION0010712000000000000000"><tt>__init__</tt> and <tt>attachSubtree</tt> Methods</A></UL><HR><A NAME="tex2html5121" HREF="page342.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html5119" HREF="page340.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html5113" HREF="page340.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html5123" 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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