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<H3><A NAME="SECTION0082144000000000000000"></A><A NAME="optparse-callback-example-1"></A>
<BR>
6.21.4.4 Callback example 1: trivial callback
</H3>

<P>
Here's an example of a callback option that takes no arguments, and
simply records that the option was seen:
<div class="verbatim"><pre>
def record_foo_seen(option, opt_str, value, parser):
    parser.saw_foo = True

parser.add_option("--foo", action="callback", callback=record_foo_seen)
</pre></div>

<P>
Of course, you could do that with the <code>store_true</code> action.

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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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