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<h1 class="title">Literal Patterns</h1>
<p>You want to ask Pyke a question. The simplest questions are just asking "Is
statement X true?". Going back to Pyke's <a class="reference external" href="../../examples.html#family-relations">family_relations</a> example, your
Python program might want to know whether it's really true that Bruce's
parents are Thomas and Norma? So it would ask whether the following statement
is true:</p>
<pre class="literal-block">
family.son_of(Bruce, Thomas, Norma)
</pre>
<p>Pyke would search the facts that's it's been told about and answer "thumbs up"
because you've told it before that this statement is true and it has
remembered that.</p>
<p>In this case, all of the statement's arguments are <em>literal patterns</em>. You
might consider literal patterns to be <em>input</em> to Pyke. You're passing Bruce,
Thomas and Norma <em>into</em> Pyke. And Pyke just answers "thumbs up" or "thumbs
down".</p>
<p>Literal patterns look exactly like data. Thus, your question would look
exactly like you see above.</p>
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<h3>More:</h3>
<div class="right-item"><a href="literal_patterns.html">Literal Patterns</a><p>Explanation of <em>literal patterns</em>.</p>
</div>
<div class="right-item"><a href="pattern_variables.html">Pattern Variables</a><p>Explanation of <em>pattern variables</em>.</p>
</div>
<div class="right-item"><a href="tuple_patterns.html">Tuple Patterns</a><p>Explanation of <em>tuple patterns</em>.</p>
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<div class="right-item"><a href="matching_patterns.html">Matching Two Patterns</a><p>Explanation of matching two patterns together, vs matching a pattern
to data.</p>
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Copyright © 2007-2009 Bruce Frederiksen
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