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performance fiddling
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Mark Pilgrim
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<title>Case study: porting chardet to Python 3 - Dive into Python 3</title>
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TypeError: Can't convert 'bytes' object to str implicitly</samp></pre>
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<p id="skipcantconvertbytesobject">...
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<p class="c">© 2001-4, 2009 <span>ℳ</span>ark Pilgrim, <a rel="license" href="http://creativecommons.org/licenses/by/3.0/">CC-BY-3.0</a>
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Vendored
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html{background:#fff;color:#000;}body{margin:28px;}body,.widgets a{font:normal medium 'Gill Sans','Gill Sans MT','Ikarius ADF',Candara,Jara,sans-serif;line-height:1.75;word-spacing:.1em;}a{background:transparent;text-decoration:none;border-bottom:1px dotted;}a:hover{border-bottom:1px solid;}a:link,.widgets a{color:#1b67c9;}a:visited{color:darkorchid;}.widgets a{text-decoration:underline;border:0;}.widgets,.widgets a,.download,.c{font-size:small;}blockquote .widgets{float:left;}blockquote .block{clear:left;}h1 a,h2 a,h3 a,#nav a{color:inherit!important;}abbr,acronym{letter-spacing:.1em;text-transform:lowercase;font-variant:small-caps;}h1,h2,h3,p,ul,ol{margin:1.75em 0;font-size:medium;}h1{background:papayawhip;width:100%;}h2,h3{clear:both;}form div{float:right;}pre{white-space:pre-wrap;padding-left:2.154em;line-height:1.75;border-left:1px dotted;}pre,kbd,code,samp{font-family:Consolas,Inconsolata,Monaco,monospace;font-size:medium;word-spacing:0;}pre a,.widgets a{padding:.4375em 0;border:0;}pre a:hover{border:0;}kbd{font-weight:bold;}.prompt{color:#667;}td pre{margin:0;padding:0;border:0;}li ol{margin:0;}.c{text-align:center;}p.fancy:first-letter{float:left;background:transparent;color:gainsboro;padding:.11em 4px 0 0;font:normal 4em/0.68 serif;}blockquote.q{margin:auto;text-align:right;font-style:oblique;}.skip a,.skip a:hover,.skip a:visited{position:absolute;left:0;top:-500px;width:1px;height:1px;overflow:hidden;}.skip a:active,.skip a:focus{position:static;width:auto;height:auto;}table{width:100%;border-collapse:collapse;}th{text-align:left;padding:0 .5em;vertical-align:baseline;border:1px dotted;}th,td{width:45%;vertical-align:top;}td{border:1px dotted;padding:0 .5em;}th:first-child{width:10%;text-align:center;}span,tr+tr th:first-child{font-family:'Arial Unicode MS',sans-serif;font-style:normal;}.q span{font-size:large;}.note{margin-left:4.94em;}.note span{display:block;float:left;font-size:xx-large;line-height:.875em;margin:0 .22em 0 -1.22em;}table.simple th{font-family:inherit!important;}.fr{width:100%;border:1px dotted;margin-top:3.5em;}.fr h4{margin-top:-1.2em;margin-left:-1em;width:8.5em;border:1px dotted;padding:3px 3px 3px 13px;background:#fff;color:inherit;position:relative;}.hover{background:#eee;color:inherit;cursor:default;}i.baa{font-family:Baskerville,Constantia,Palatino,'Palatino Linotype','URW Palladio L','URW Bookman L',serif;}body{counter-reset:h1;}h1:before{content:"Chapter " counter(h1) ". ";}h1{counter-reset:h2;}h2:before{counter-increment:h2;content:counter(h1) "." counter(h2) ". ";}h2{counter-reset:h3;}h3:before{counter-increment:h3;content:counter(h1) "." counter(h2) "." counter(h3) ". ";}
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<samp>5.5</samp>
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<a><samp class="prompt">>>> </samp><kbd>11 // 2</kbd> <span>②</span></a>
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<samp>5</samp>
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<a><samp class="prompt">>>> </samp><kbd>−11 // 2</kbd> <span>④</span></a>
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<a><samp class="prompt">>>> </samp><kbd>−11 // 2</kbd> <span>③</span></a>
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<samp>−6</samp>
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<a><samp class="prompt">>>> </samp><kbd>11.0 // 2</kbd> <span>③</span></a>
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<a><samp class="prompt">>>> </samp><kbd>11.0 // 2</kbd> <span>④</span></a>
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<samp>5.0</samp>
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<a><samp class="prompt">>>> </samp><kbd>11 ** 2</kbd> <span>⑤</span></a>
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<samp>121</samp>
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<meta charset="utf-8">
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<title>Porting code to Python 3 with 2to3 - Dive into Python 3</title>
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<link rel="stylesheet" type="text/css" href="dip3.css">
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<script type="text/javascript" src="http://www.google.com/jsapi"></script>
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@@ -1274,5 +1272,7 @@ do_stuff(a_list)</code></pre></td></tr>
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<p id="skipcompareidioms">
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<p>FIXME: once the rest of the book is written, this appendix should contain copious links back to any chapter or section that touches on these features.
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<p class="c">© 2001-4, 2009 <span>ℳ</span>ark Pilgrim, <a rel="license" href="http://creativecommons.org/licenses/by/3.0/">CC-BY-3.0</a>
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<script type="text/javascript" src="http://www.google.com/jsapi"></script>
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<script type="text/javascript" src="dip3.js"></script>
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+28
-28
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<li>Optimizing string manipulation
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<li>Summary
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</ol>
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<li><a href="case-study-porting-chardet-to-python-3.html">Case study: porting <code>chardet</code> to Python 3</a>
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<ol>
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<li><a href="case-study-porting-chardet-to-python-3.html#divingin">Introducing <code class="filename">chardet</code>: a mini-FAQ</a>
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<ol>
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<li><a href="case-study-porting-chardet-to-python-3.html#faq.what">What is character encoding auto-detection?</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#faq.impossible">Isn't that impossible?</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#faq.who">Who wrote this detection algorithm?</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#faq.yippie">Yippie! Screw the standards, I'll just auto-detect everything!</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#faq.why">Why bother with auto-detection if it's slow, inaccurate, and non-standard?</a>
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</ol>
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<li><a href="case-study-porting-chardet-to-python-3.html#divingin2">Diving in</a>
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<ol>
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<li><a href="case-study-porting-chardet-to-python-3.html#how.bom"><code>UTF-n</code> with a <abbr title="Byte Order Mark">BOM</abbr></a>
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<li><a href="case-study-porting-chardet-to-python-3.html#how.esc">Escaped encodings</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#how.mb">Multi-byte encodings</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#how.sb">Single-byte encodings</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#how.windows1252"><code>windows-1252</code></a>
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</ol>
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<li><a href="case-study-porting-chardet-to-python-3.html#running2to3">Running <code class="filename">2to3</code></a>
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<li><a href="case-study-porting-chardet-to-python-3.html#manual">Fixing what <code class="filename">2to3</code> can't</a>
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<ol>
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<li><a href="case-study-porting-chardet-to-python-3.html#falseisinvalidsyntax"><code>False</code> is invalid syntax</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#nomodulenamedconstants">No module named <code class="filename">constants</code></a>
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<li><a href="case-study-porting-chardet-to-python-3.html#namefileisnotdefined">Name '<var>file</var>' is not defined</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#cantuseastringpattern">Can't use a string pattern on a bytes-like object</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#cantconvertbytesobject">Can't convert '<code>bytes</code>' object to <code>str</code> implicitly</a>
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</ol>
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</ol>
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<li>Packaging Python libraries
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<!-- http://pypi.python.org/pypi -->
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<ol>
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<li>PyPy
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<li>Stackless Python
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</ol>
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<li><a href="case-study-porting-chardet-to-python-3.html">Case study: porting <code>chardet</code> to Python 3</a>
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<ol>
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<li><a href="case-study-porting-chardet-to-python-3.html#divingin">Introducing <code class="filename">chardet</code>: a mini-FAQ</a>
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<ol>
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<li><a href="case-study-porting-chardet-to-python-3.html#faq.what">What is character encoding auto-detection?</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#faq.impossible">Isn't that impossible?</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#faq.who">Who wrote this detection algorithm?</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#faq.yippie">Yippie! Screw the standards, I'll just auto-detect everything!</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#faq.why">Why bother with auto-detection if it's slow, inaccurate, and non-standard?</a>
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</ol>
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<li><a href="case-study-porting-chardet-to-python-3.html#divingin2">Diving in</a>
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<ol>
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<li><a href="case-study-porting-chardet-to-python-3.html#how.bom"><code>UTF-n</code> with a <abbr title="Byte Order Mark">BOM</abbr></a>
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<li><a href="case-study-porting-chardet-to-python-3.html#how.esc">Escaped encodings</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#how.mb">Multi-byte encodings</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#how.sb">Single-byte encodings</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#how.windows1252"><code>windows-1252</code></a>
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</ol>
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<li><a href="case-study-porting-chardet-to-python-3.html#running2to3">Running <code class="filename">2to3</code></a>
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<li><a href="case-study-porting-chardet-to-python-3.html#manual">Fixing what <code class="filename">2to3</code> can't</a>
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<ol>
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<li><a href="case-study-porting-chardet-to-python-3.html#falseisinvalidsyntax"><code>False</code> is invalid syntax</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#nomodulenamedconstants">No module named <code class="filename">constants</code></a>
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<li><a href="case-study-porting-chardet-to-python-3.html#namefileisnotdefined">Name '<var>file</var>' is not defined</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#cantuseastringpattern">Can't use a string pattern on a bytes-like object</a>
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<li><a href="case-study-porting-chardet-to-python-3.html#cantconvertbytesobject">Can't convert '<code>bytes</code>' object to <code>str</code> implicitly</a>
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</ol>
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</ol>
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</ol>
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<ul>
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<li><a href="porting-code-to-python-3-with-2to3.html">Appendix A. Porting code to Python 3 with <code class="filename">2to3</code></a>
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<meta charset="utf-8">
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<title>Your first Python program - Dive into Python 3</title>
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<style type="text/css">
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@@ -240,5 +238,7 @@ if __name__ == "__main__":
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</ul>
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</div>
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<p class="c">© 2001-4, 2009 <span>ℳ</span>ark Pilgrim, <a rel="license" href="http://creativecommons.org/licenses/by/3.0/">CC-BY-3.0</a>
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<script type="text/javascript" src="http://www.google.com/jsapi"></script>
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<script type="text/javascript" src="dip3.js"></script>
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</body>
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</html>
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