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<H2><A NAME="SECTION004320000000000000000"></A>
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2.3.2 Reserved classes of identifiers
</H2>

<P>
Certain classes of identifiers (besides keywords) have special
meanings.  These are:

<P>
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    <tr bgcolor="#99CCFF">
      <th align=left><b>Form</b></th>
      <th align=left><b>Meaning</b></th>
      <th align=left><b>Notes</b></th>
    </thead>
  <tbody valign=baseline>
    <tr><td valign=baseline><code>_*</code></td>
        <td>Not imported by "<tt class=samp>from <var>module</var> import *</tt>"</td>
        <td>(1)&nbsp;</td>
    <tr><td valign=baseline><code>__*__</code></td>
        <td>System-defined name</td>
        <td>&nbsp;</td>
    <tr><td valign=baseline><code>__*</code></td>
        <td>Class-private name mangling</td>
        <td>&nbsp;</td></tbody>
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<P>
(XXX need section references here.)

<P>
Note:

<P>
<DL>
<DT><STRONG>(1)</STRONG>
<DD>The special identifier "<tt class=samp>_</tt>" is used in the interactive
interpreter to store the result of the last evaluation; it is stored
in the <tt class=module>__builtin__</tt> module.  When not in interactive mode,
"<tt class=samp>_</tt>" has no special meaning and is not defined.
</DL>

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