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<H2>
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3.18.1 Interactive Interpreter Objects
</H2>
<P>
<dl><dt><b><a name='l2h-484'><tt class='method'>runsource</tt></a></b> (<var>source</var><big>[</big><var>, filename</var><big>[</big><var>, symbol</var><big>]</big><big>]</big>)
<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>0</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>1</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>0</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><b><a name='l2h-485'><tt class='method'>runcode</tt></a></b> (<var>code</var>)
<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><b><a name='l2h-486'><tt class='method'>showsyntaxerror</tt></a></b> (<big>[</big><var>filename</var><big>]</big>)
<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><b><a name='l2h-487'><tt class='method'>showtraceback</tt></a></b> ()
<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><b><a name='l2h-488'><tt class='method'>write</tt></a></b> (<var>data</var>)
<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>
<P>
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