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case-study-porting-chardet-to-python-3.html

@@ -68,7 +68,6 @@ mark{background:#ff8;font-weight:bold}
 <h2 id=running2to3>Running <code>2to3</code></h2>
 <p>We&#8217;re going to migrate the <code>chardet</code> module from Python 2 to Python 3. Python 3 comes with a utility script called <code>2to3</code>, which takes your actual Python 2 source code as input and auto-converts as much as it can to Python 3. In some cases this is easy &mdash; a function was renamed or moved to a different modules &mdash; but in other cases it can get pretty complex. To get a sense of all that it <em>can</em> do, refer to the appendix, <a href=porting-code-to-python-3-with-2to3.html>Porting code to Python 3 with <code>2to3</code></a>. In this chapter, we&#8217;ll start by running <code>2to3</code> on the <code>chardet</code> package, but as you&#8217;ll see, there will still be a lot of work to do after the automated tools have performed their magic.
 <p>The main <code>chardet</code> package is split across several different files, all in the same directory. The <code>2to3</code> script makes it easy to convert multiple files at once: just pass a directory as a command line argument, and <code>2to3</code> will convert each of the files in turn.
-<p id=noscript>[The code examples will be easier to follow if you enable Javascript, but whatever.]
 <pre class=screen><samp class=p>C:\home\chardet> </samp><kbd>python c:\Python30\Tools\Scripts\2to3.py -w chardet\</kbd>
 <samp>RefactoringTool: Skipping implicit fixer: buffer
 RefactoringTool: Skipping implicit fixer: idioms

dip3.js

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html5.js

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native-datatypes.html

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 <h2 id=booleans>Booleans</h2>
 <p>Booleans are either true or false. Python has two constants, <code>True</code> and <code>False</code>, which can be used to assign boolean values directly. Expressions can also evaluate to a boolean value. In certain places (like <code>if</code> statements), Python expects an expression to evaluate to a boolean value. These places are called <i>boolean contexts</i>. You can use virtually any expression in a boolean context, and Python will try to determine its truth value. Different datatypes have different rules about which values are true or false in a boolean context. (This will make more sense once you see some concrete examples later in this chapter.)
 <p>For example, take this snippet from <a href=your-first-python-program.html#divingin><code>humansize.py</code></a>:
-<p id=noscript>[The code examples will be easier to follow if you enable Javascript, but whatever.]
 <pre><code>if size &lt; 0:
     raise ValueError('number must be non-negative')</code></pre>
 <p><var>size</var> is an integer, <code>0</code> is an integer, and <code>&lt;</code> is a numerical operator. The result of the expression <code>size &lt; 0</code> is always a boolean. You can test this yourself in the Python interactive shell:

porting-code-to-python-3-with-2to3.html

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 <p class=f>Virtually all Python 2 programs will need at least some tweaking to run properly under Python 3. To help with this transition, Python 3 comes with a utility script called <code>2to3</code>, which takes your actual Python 2 source code as input and auto-converts as much as it can to Python 3. <a href=case-study-porting-chardet-to-python-3.html#running2to3>Case study: porting <code>chardet</code> to Python 3</a> describes how to run the <code>2to3</code> script, then shows some things it can't fix automatically. This appendix documents what it <em>can</em> fix automatically.
 <h2 id=print><code>print</code> statement</h2>
 <p>In Python 2, <code>print</code> was a statement. Whatever you wanted to print simply followed the <code>print</code> keyword. In Python 3, <code>print()</code> is a function &mdash; whatever you want to print is passed to <code>print()</code> like any other function.
-<p id=noscript>[The code examples will be easier to follow if you enable Javascript, but whatever.]
 <table>
 <tr>
 <th class=notes>Notes</th>

regular-expressions.html

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 </blockquote>
 <h2 id=streetaddresses>Case study: street addresses</h2>
 <p>This series of examples was inspired by a real-life problem I had in my day job several years ago, when I needed to scrub and standardize street addresses exported from a legacy system before importing them into a newer system. (See, I don&#8217;t just make this stuff up; it&#8217;s actually useful.)  This example shows how I approached the problem.
-<p id=noscript>[The code examples will be easier to follow if you enable Javascript, but whatever.]
 <pre class=screen>
 <samp class=p>>>> </samp><kbd>s = '100 NORTH MAIN ROAD'</kbd>
 <a><samp class=p>>>> </samp><kbd>s.replace('ROAD', 'RD.')</kbd>                <span>&#x2460;</span></a>

unit-testing.html

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 <li>The <code>to_roman()</code> function should return the Roman numeral representation for all integers <code>1</code> to <code>3999</code>.
 </ol>
 <p>It is not immediately obvious how this code does&hellip; well, <em>anything</em>. It defines a class which has no <code>__init__()</code> method. The class <em>does</em> have another method, but it is never called. The entire script has a <code>__main__</code> block, but it doesn't reference the class or its method. But it does do something, I promise.
-<p id=noscript>[The code examples will be easier to follow if you enable Javascript, but whatever.]
 <p class=download>[<a href=romantest1.py>download <code>romantest1.py</code></a>]
 <pre><code>import roman1
 import unittest

your-first-python-program.html

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 <p id=toc>&nbsp;
 <h2 id=divingin>Diving in</h2>
 <p class=f>Books about programming usually start with a bunch of boring chapters about fundamentals and eventually 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.
-<p id=noscript>[The code examples will be easier to follow if you enable Javascript, but whatever.]
 <p class=download>[<a href=humansize.py>download <code>humansize.py</code></a>]
 <pre><code>SUFFIXES = {1000: ['KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'],
             1024: ['KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB']}