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<HTML><HEAD><TITLE>Iterators</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="tex2html7309" HREF="page535.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html7307" HREF="page533.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html7303" HREF="page533.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html7311" HREF="page611.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="../icons/index_motif.gif"></A> <BR><HR><H3><A NAME="SECTION0016211000000000000000">Iterators</A></H3><P>Program&nbsp;<A HREF="page533.html#progvertexa"><IMG  ALIGN=BOTTOM ALT="gif" SRC="../icons/cross_ref_motif.gif"></A> also declares four properties that return iterators.The <tt>incidentEdges</tt> propertyreturns an iterator that enumeratesthe elements of the  <IMG WIDTH=30 HEIGHT=24 ALIGN=MIDDLE ALT="tex2html_wrap_inline70651" SRC="img2183.gif"  >;the <tt>emanatingEdges</tt> propertyreturns an iterator that enumeratesthe elements of  <IMG WIDTH=32 HEIGHT=24 ALIGN=MIDDLE ALT="tex2html_wrap_inline70619" SRC="img2176.gif"  >.Similarly, the <tt>predecessors</tt> propertyreturns an iterator that enumeratesthe elements of  <IMG WIDTH=178 HEIGHT=24 ALIGN=MIDDLE ALT="tex2html_wrap_inline71011" SRC="img2258.gif"  >and the <tt>successors</tt> propertyreturns an iterator that enumeratesthe elements of  <IMG WIDTH=185 HEIGHT=24 ALIGN=MIDDLE ALT="tex2html_wrap_inline71013" SRC="img2259.gif"  >.The elements of  <IMG WIDTH=32 HEIGHT=24 ALIGN=MIDDLE ALT="tex2html_wrap_inline71015" SRC="img2260.gif"  > and  <IMG WIDTH=31 HEIGHT=24 ALIGN=MIDDLE ALT="tex2html_wrap_inline71017" SRC="img2261.gif"  > are verticeswhereas the elements of  <IMG WIDTH=30 HEIGHT=24 ALIGN=MIDDLE ALT="tex2html_wrap_inline70651" SRC="img2183.gif"  > and  <IMG WIDTH=32 HEIGHT=24 ALIGN=MIDDLE ALT="tex2html_wrap_inline70619" SRC="img2176.gif"  > are edges.<P><HR><A NAME="tex2html7309" HREF="page535.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html7307" HREF="page533.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html7303" HREF="page533.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html7311" 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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