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<title>3.23.1 Interactive Interpreter Objects </title>
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<H2><A NAME="SECTION0052310000000000000000"><!--x--></A><A NAME="interpreter-objects"><!--z--></A>
<BR>
3.23.1 Interactive Interpreter Objects
</H2>
<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
<td><nobr><b><tt id='l2h-720' class="method">runsource</tt></b>(</nobr></td>
<td><var>source</var><big>[</big><var>, filename</var><big>[</big><var>, symbol</var><big>]</big><big>]</big>)</td></tr></table></dt>
<dd>
Compile and run some source in the interpreter.
Arguments are the same as for <tt class="function">compile_command()</tt>; the
default for <var>filename</var> is <code>'<input>'</code>, and for
<var>symbol</var> is <code>'single'</code>. One several things can happen:
<P>
<UL>
<LI>The input is incorrect; <tt class="function">compile_command()</tt> raised an
exception (<tt class="exception">SyntaxError</tt> or <tt class="exception">OverflowError</tt>). A
syntax traceback will be printed by calling the
<tt class="method">showsyntaxerror()</tt> method. <tt class="method">runsource()</tt> returns
<code>False</code>.
<P>
</LI>
<LI>The input is incomplete, and more input is required;
<tt class="function">compile_command()</tt> returned <code>None</code>.
<tt class="method">runsource()</tt> returns <code>True</code>.
<P>
</LI>
<LI>The input is complete; <tt class="function">compile_command()</tt> returned a code
object. The code is executed by calling the <tt class="method">runcode()</tt> (which
also handles run-time exceptions, except for <tt class="exception">SystemExit</tt>).
<tt class="method">runsource()</tt> returns <code>False</code>.
</LI>
</UL>
<P>
The return value can be used to decide whether to use
<code>sys.ps1</code> or <code>sys.ps2</code> to prompt the next line.
</dl>
<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
<td><nobr><b><tt id='l2h-721' class="method">runcode</tt></b>(</nobr></td>
<td><var>code</var>)</td></tr></table></dt>
<dd>
Execute a code object.
When an exception occurs, <tt class="method">showtraceback()</tt> is called to
display a traceback. All exceptions are caught except
<tt class="exception">SystemExit</tt>, which is allowed to propagate.
<P>
A note about <tt class="exception">KeyboardInterrupt</tt>: this exception may occur
elsewhere in this code, and may not always be caught. The caller
should be prepared to deal with it.
</dl>
<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
<td><nobr><b><tt id='l2h-722' class="method">showsyntaxerror</tt></b>(</nobr></td>
<td><big>[</big><var>filename</var><big>]</big>)</td></tr></table></dt>
<dd>
Display the syntax error that just occurred. This does not display
a stack trace because there isn't one for syntax errors.
If <var>filename</var> is given, it is stuffed into the exception instead
of the default filename provided by Python's parser, because it
always uses <code>'<string>'</code> when reading from a string.
The output is written by the <tt class="method">write()</tt> method.
</dl>
<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
<td><nobr><b><tt id='l2h-723' class="method">showtraceback</tt></b>(</nobr></td>
<td>)</td></tr></table></dt>
<dd>
Display the exception that just occurred. We remove the first stack
item because it is within the interpreter object implementation.
The output is written by the <tt class="method">write()</tt> method.
</dl>
<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
<td><nobr><b><tt id='l2h-724' class="method">write</tt></b>(</nobr></td>
<td><var>data</var>)</td></tr></table></dt>
<dd>
Write a string to the standard error stream (<code>sys.stderr</code>).
Derived classes should override this to provide the appropriate output
handling as needed.
</dl>
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<span class="release-info">Release 2.3.4, documentation updated on May 20, 2004.</span>
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