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<HTML><HEAD><TITLE>__init__ 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="tex2html4534" HREF="page290.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html4532" HREF="page287.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html4526" HREF="page288.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html4536" HREF="page611.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="../icons/index_motif.gif"></A> <BR><HR><H3><A NAME="SECTION009652000000000000000"><tt>__init__</tt> method</A></H3><P>Program&nbsp;<A HREF="page287.html#progbinaryTreea"><IMG  ALIGN=BOTTOM ALT="gif" SRC="../icons/cross_ref_motif.gif"></A> defines the <tt>__init__</tt> methodfor the <tt>BinaryTree</tt> class.In addition to <tt>self</tt>,the <tt>__init__</tt> method takes either zero, one, or exactly three arguments.When no arguments are provided,the <tt>__init__</tt> method creates an empty binary tree.It simply sets all three instance attributes to <tt>None</tt>.<P>When one argument is provided,the third <tt>__init__</tt> method creates a binary treewith the specified object as its root.Since every binary tree has exactly two subtrees,the <tt>__init__</tt> method creates two empty subtrees and assigns themto the <tt>_left</tt> and <tt>_right</tt> instance attributes.<P>Finally,when exactly three arguments are provided,the <tt>__init__</tt> method assigns each of themto the corresponding instance attribute.In all cases, the running time of the <tt>__init__</tt> method is <I>O</I>(1).<P><HR><A NAME="tex2html4534" HREF="page290.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html4532" HREF="page287.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html4526" HREF="page288.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html4536" 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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