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Mark Pilgrim
2009-02-17 16:46:24 -05:00
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<h2 id=divingin>(Not) diving in</h2>
<p class=fancy>In previous chapters, you &#8220;dived in&#8221; by immediately looking at code and trying to understand it as quickly as possible. Now that you have some Python under your belt, you're going to step back and look at the steps that happen <em>before</em> the code gets written.
<p>In this chapter, you're going to write, debug, and optimize a set of utility functions to convert to and from Roman numerals. You saw the mechanics of constructing and validating Roman numerals in <a href="regular-expressions.html#romannumerals">&#8220;Case study: roman numerals&#8221;</a>. Now let's step back and consider what it would take to expand that into a two-way utility.
<p class=fancy>How do you know that the code you wrote yesterday still works after the changes you made today? Every seasoned programmer has war stories of an &#8220;innocent&#8221; change that couldn't <em>possibly</em> have affected that other &#8220;unrelated&#8221; module&hellip; If this sounds familiar, this chapter is for you.
<p>In this chapter, you're going to write and debug a set of utility functions to convert to and from Roman numerals. You saw the mechanics of constructing and validating Roman numerals in <a href="regular-expressions.html#romannumerals">&#8220;Case study: roman numerals&#8221;</a>. Now step back and consider what it would take to expand that into a two-way utility.
<p><a href="regular-expressions.html#romannumerals">The rules for Roman numerals</a> lead to a number of interesting observations:
<ol>
<li>There is only one correct way to represent a particular number as Roman numerals.