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Mark Pilgrim
2009-02-06 23:45:03 -05:00
parent 8b300049d9
commit dd7fdb87ac
5 changed files with 40 additions and 5 deletions
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your-first-python-program.html
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@@ -4,7 +4,7 @@
<meta charset="utf-8">
<title>Your first Python program - Dive into Python 3</title>
<link rel="stylesheet" type="text/css" href="dip3.css">
<script type="text/javascript" src="dip3.packed.js"></script>
<script type="text/javascript" src="dip3.js"></script>
<link rel="shortcut icon" href="data:image/ico,">
<link rel="alternate" type="application/atom+xml" href="http://hg.diveintopython3.org/atom-log">
<style type="text/css">
@@ -38,7 +38,9 @@ body{counter-reset:h1 1}
</ol>
<h2 id="divingin">Diving in</h2>
<p class="fancy">You know how other books go on and on about programming fundamentals and finally work up to building something useful? Let's skip all that. Here is a complete, working Python program. It probably makes absolutely no sense to you. Don't worry about that, because you're going to dissect it line by line. But read through it first and see what, if anything, you can make of it.
<pre><code class="python">SUFFIXES = {1000: ('KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'),
<!-- FIXME: download link -->
<p class="download">[<a href="humansize.py">download</a>]</p>
<pre><code>SUFFIXES = {1000: ('KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'),
1024: ('KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB')}
def approximate_size(size, a_kilobyte_is_1024_bytes=True):
@@ -74,6 +76,7 @@ if __name__ == "__main__":
<pre class="screen"><samp class="prompt">you@localhost:~$ </samp><kbd>python3 humansize.py</kbd>
<samp>1.0 TB
931.3 GiB</samp></pre>
<!-- FIXME: this would be a good place to explain what the program, you know, actually does -->
<h2 id="declaringfunctions">Declaring functions</h2>
<p>Python has functions like most other languages, but it does not have separate header files like <abbr>C++</abbr> or <code>interface</code>/<code>implementation</code> sections like Pascal. When you need a function, just declare it, like this:
<pre><code>def approximate_size(size, a_kilobyte_is_1024_bytes=True):</code></pre>