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<H2><A NAME="SECTION00101310000000000000000"></A>
<BR>
8.13.1 Popen3 Objects
</H2>

<P>
Instances of the <tt class=class>Popen3</tt> class have the following methods:

<P>
<dl><dt><b><a name="l2h-1538"><tt class=method>poll</tt></a></b> ()
<dd>
Returns <tt>-1</tt> if child process hasn't completed yet, or its return 
code otherwise.
</dl>

<P>
<dl><dt><b><a name="l2h-1539"><tt class=method>wait</tt></a></b> ()
<dd>
Waits for and returns the return code of the child process.
</dl>

<P>
The following attributes of <tt class=class>Popen3</tt> objects are also available: 

<P>
<dl><dt><b><a name="l2h-1540"><tt>fromchild</tt></a></b>
<dd>
A file object that provides output from the child process.
</dl>

<P>
<dl><dt><b><a name="l2h-1541"><tt>tochild</tt></a></b>
<dd>
A file object that provides input to the child process.
</dl>

<P>
<dl><dt><b><a name="l2h-1542"><tt>childerr</tt></a></b>
<dd>
Where the standard error from the child process goes is
<var>capturestderr</var> was true for the constructor, or <tt>None</tt>.
</dl><p>
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