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<HTML><HEAD><TITLE>getIsEmpty Method</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="tex2html4477" HREF="page285.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html4475" HREF="page281.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html4469" HREF="page283.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html4479" HREF="page611.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="../icons/index_motif.gif"></A> <BR><HR><H3><A NAME="SECTION009643000000000000000"><tt>getIsEmpty</tt> Method</A></H3><P>The <tt>getIsEmpty</tt> methodindicates whether a given <I>N</I>-ary tree is the empty tree.The implementation of this method is given in Program&nbsp;<A HREF="page284.html#prognaryTreeb"><IMG  ALIGN=BOTTOM ALT="gif" SRC="../icons/cross_ref_motif.gif"></A>.In this implementation,the <tt>key</tt> instance attribute is <tt>None</tt> if the tree is the empty tree.Therefore, <tt>getIsEmpty</tt> methodsimply tests the <tt>key</tt> instance attribute.Clearly, this is a constant time operation.<P><P><A NAME="16332">&#160;</A><A NAME="prognaryTreeb">&#160;</A> <IMG WIDTH=575 HEIGHT=523 ALIGN=BOTTOM ALT="program16244" SRC="img1129.gif"  ><BR><STRONG>Program:</STRONG> <tt>NaryTree</tt> class <tt>getKey</tt>, <tt>getIsEmpty</tt>, 	<tt>attachKey</tt> and <tt>detachKey</tt> methods.<BR><P><HR><A NAME="tex2html4477" HREF="page285.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html4475" HREF="page281.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html4469" HREF="page283.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html4479" 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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