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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><!-- InstanceBegin template="/Templates/template.dwt" codeOutsideHTMLIsLocked="false" -->
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>VPython Help</title>
<!-- InstanceEndEditable -->
<!-- InstanceBeginEditable name="head" -->
<link href="VisualRef.css" rel="stylesheet" type="text/css" />
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<script type="text/javascript">
function MM_jumpMenu(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
<table width="800" border="0" cellpadding="1" cellspacing="0">
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    <td width="10" valign="top" bgcolor="#FFFFFF"><!--DWLayoutEmptyCell-->&nbsp;</td>
    <td width="10" height="272" valign="top" bgcolor="#DDDDDD"><p>&nbsp;</p>    </td>
    <td width="173" valign="top" bgcolor="#DDDDDD"><p class="Normal"><a href="index.html">Home</a></p>
      <p class="Normal">If you're new to Python <br />
      and VPython: <a href="VisualIntro.html">Introduction</a></p>
      <p class="Normal">A VPython <a href="VPython_Intro.pdf" target="_blank">tutorial</a></p>
      <p class="Normal"><a href="primitives.html">Pictures</a> of 3D objects</p>
<p><select id="menu1" onchange="jumpMenu(this)"></select></p>
<p><select id="menu2" onchange="jumpMenu(this)"></select></p>
<p><select id="menu3" onchange="jumpMenu(this)"></select></p>
    <p class="Normal"><a href="new_features.html">What's new</a></p>
    <p class="Normal"><a href="http://vpython.org" target="_blank">Classic VPython web site</a><br />
      <a href="license.txt" target="_blank">VPython license</a><br />
      <a href="http://www.python.org" target="_blank">Python web site</a> <br /></p></td>
    <td width="21" valign="top" bgcolor="#FFFFFF"><!--DWLayoutEmptyCell-->&nbsp;</td>
    <td width="586" rowspan="2" valign="top"><!-- InstanceBeginEditable name="content" -->
      <div>
        <h1 class="Heading-1"> <font color="#0000A0">Deleting an Object</font></h1>
      </div>
      <div>
        <p class="Normal"> To hide a VPython object just make it invisible: <span class="attribute">ball.visible 
          = False</span>. This does not delete the object from computer memory, and you can make it visible again later.</p>
        <p class="Normal">If however you later re-use the name <span class="attribute">ball</span>, 
          for example by creating a new object and naming it <span class="attribute">ball</span>, 
          Python will be free to release the memory used by the object formerly named <span class="attribute">ball</span> (assuming no other names currently refer 
          to that object). If the object is visible when you re-use the name <span class="attribute">ball</span>, the original object will not be deleted from computer memory, and it will remain visible in the window.</p>
        <p class="Normal">After you make an object named ball invisible, you can delete it immediately with <span class="attribute">del ball</span>.</p>
      </div>
      <div> </div>
    <!-- InstanceEndEditable --></td>
    <td height="16" colspan="4"></td>
<script type="text/javascript" language="javascript" src="navigation.js"></script>
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