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<HTML><HEAD><TITLE>New-Style Classes</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="tex2html1525" HREF="page29.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html1523" HREF="page22.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html1517" HREF="page27.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html1527" HREF="page611.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="../icons/index_motif.gif"></A> <BR><HR><H3><A NAME="SECTION001406000000000000000">New-Style Classes</A></H3><P>Python provides two styles of classes -- <em>classic</em> classes and <em>new-style</em> classes.In this book we use Python <em>new-style</em> classes exclusively.New-style classes support <em>property</em> attributesand provide a method resolution order that satisfies the constraintsof local precedence ordering and monotonicity<A NAME="tex2html1" HREF="footnode.html#178"><IMG  ALIGN=BOTTOM ALT="gif" SRC="../icons/foot_motif.gif"></A>.<P>All Python all new-style classes are ultimately derived fromthe built-in class called <tt>__builtin__.object</tt>.This is how a new-style class is distinguished from a <em>classic</em> class.<P><HR><A NAME="tex2html1525" HREF="page29.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html1523" HREF="page22.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html1517" HREF="page27.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html1527" 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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