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completed the six presentation

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Julio Biason 8 years ago
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<!doctype html> <!doctype html>
<html lang="en"> <html lang="en">
<head> <head>
<meta charset="utf-8"> <meta charset="utf-8">
<title>Python 2 + 3 = Six</title> <title>Python 2 + 3 = Six</title>
<meta name="description" content="A framework for easily creating beautiful presentations using HTML"> <meta name="description" content="A framework for easily creating beautiful presentations using HTML">
<meta name="author" content="Hakim El Hattab"> <meta name="author" content="Hakim El Hattab">
<meta name="apple-mobile-web-app-capable" content="yes"> <meta name="apple-mobile-web-app-capable" content="yes">
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var link = document.createElement( 'link' ); var link = document.createElement( 'link' );
link.rel = 'stylesheet'; link.rel = 'stylesheet';
link.type = 'text/css'; link.type = 'text/css';
link.href = window.location.search.match( /print-pdf/gi ) ? 'css/print/pdf.css' : 'css/print/paper.css'; link.href = window.location.search.match( /print-pdf/gi ) ? 'css/print/pdf.css' : 'css/print/paper.css';
document.getElementsByTagName( 'head' )[0].appendChild( link ); document.getElementsByTagName( 'head' )[0].appendChild( link );
</script> </script>
<!--[if lt IE 9]> <!--[if lt IE 9]>
<script src="lib/js/html5shiv.js"></script> <script src="lib/js/html5shiv.js"></script>
<![endif]--> <![endif]-->
<style type="text/css" media="screen"> <style type="text/css" media="screen">
.happy { .happy {
color: yellow; color: yellow;
} }
</style>
</head> .semi-opaque {
background-color: rgba(0, 0, 0, 0.7);
<body> }
<div class="reveal">
<div class="slides"> .reveal section img {
<section> border: none;
<section> }
<h1>Python 2 + 3 = Six</h1> </style>
</section> </head>
</section>
<body>
<div class="reveal">
<div class="slides">
<section>
<section data-background="_images/snake-six.jpg">
<h1 class="semi-opaque">Python 2 + 3 = Six</h1>
</section>
</section>
<section> <section>
<section> <section>
<img src="_images/AYV1X0yv.png" alt="Me" style="float:left;"> <img src="_images/AYV1X0yv.png" alt="Me" style="float:left;" class="no-border">
<div> <div>
<ul> <ul>
<li>Júlio Biason</li> <li>Júlio Biason</li>
<li>CWI Software</li> <li><img src="_images/logo-horizontal-claro.png" alt="CWI Software" class='no-border'>
<li>@juliobiason</li> <li>@juliobiason</li>
<li>julio.biason@gmail.com</li> <li>julio.biason@gmail.com</li>
</ul> </ul>
</div> </div>
</section> </section>
</section> </section>
<section> <section>
<section> <section>
<h2>Por que Python 3?</h2> <h2>Por que Python 3?</h2>
<ul> <ul>
<li>Unicode por padrão <span class="frament">(adeus UnicodeDecodeError)</span></li> <li>Unicode por padrão <span class="frament">(adeus UnicodeDecodeError)</span></li>
<li class="fragment">AsyncIO</li> <li class="fragment">Mock é uma classe padrão</li>
<li class="fragment">SUPORTE AO PYTHON 2 TERMINA EM 2020!</li> <li class="fragment">Enum é uma classe padrão</li>
</ul> <li class="fragment">AsyncIO</li>
<li class="fragment">SUPORTE AO PYTHON 2 TERMINA EM 2020!</li>
<aside class="notes"> </ul>
Segundo especialistas, python asyncio com pyuv consegue ser mais
performático que NodeJS. <aside class="notes">
</aside> Segundo especialistas, python asyncio com pyuv consegue ser mais
</section> performático que NodeJS.
</aside>
<section> </section>
<img src="_images/bigstock-decorated-christmas-tree-close-76005554-1.jpg" style='float:left;' width="20%">
<img src='_images/carna-index-04.jpg' class="fragment" width="20%">
<img src="_images/2020.jpg" style='float:right;' class="fragment", width="20%">
<aside class="notes">
Gente, natal tá chegando aí, logo depois vem o carnaval e,
quando tu vê, já é 2020.
</aside>
</section>
</section>
<section> <section>
<section> <img src="_images/bigstock-decorated-christmas-tree-close-76005554-1.jpg" style='float:left;' width="20%">
<h2>Caminho para o Python 3</h2> <img src='_images/carna-index-04.jpg' class="fragment" width="20%">
<img src="_images/2020.jpg" style='float:right;' class="fragment", width="20%">
<ul>
<li><code>python -3 [script]</code></li> <aside class="notes">
<li><code>2to3</code></li> Gente, natal tá chegando aí, logo depois vem o carnaval e,
</ul> quando tu vê, já é 2020.
</section> </aside>
</section>
<section> </section>
<h2>O que <code>2to3</code> arruma</h2>
<ul>
<li><code>print</code> não vai funcionar (é função)</li>
<li><code>iter*</code> não vai funcionar</li>
<li><code>urlib</code> mudou tudo</li>
<li><code>urlparse</code> mudou tudo</li>
<li><code>xrange</code> agora é <code>range</code> e o velho <code>range</code> não existe mais.</li>
<li><code>raw_input</code> mudou</li>
</ul>
<p class="fragment">(<code>%</code> para formatar strings
retornou, <code>2to3</code> não muda para <code>format()</code>)</p>
</section>
<section>
<p>
... mas agora o código pode ter ficado incompatível com
Python 2...
</p>
</section>
</section>
<section> <section>
<section> <section>
<h3>"Mais minha infra usa Centos 4 e não tem Python 3 pra Centos!"</h3> <h2>Caminho para o Python 3</h2>
<img src="_images/boycrying.jpg" alt=""/>
</section> <ul>
<li><code>python -3 [script]</code></li>
<li><code>2to3</code></li>
</ul>
</section>
<section> <section>
<h1>Six ao resgate!</h1> <h2>O que <code>2to3</code> arruma</h2>
<ul>
<li><code>print</code> não vai funcionar (é função)</li>
<li><code>iter*</code> não vai funcionar</li>
<li><code>urlib</code> mudou tudo</li>
<li><code>urlparse</code> mudou tudo</li>
<li><code>xrange</code> agora é <code>range</code> e o velho <code>range</code> não existe mais.</li>
<li><code>raw_input</code> mudou</li>
</ul>
<p class="fragment">(<code>%</code> para formatar strings
retornou, <code>2to3</code> não muda para <code>format()</code>)</p>
</section>
<h2 class="fragment">e seu fiel companheiro <code>__future__</code>!</h2> <section>
</section> <p>
... mas agora o código pode ter ficado incompatível com
Python 2...
</p>
</section>
</section>
<section> <section>
<h2>Exemplo <span class="fragment">(estúpido)</span></h2> <section>
<pre><code>import collections <h3>"Minha infra usa Centos 4 e não tem Python 3 pra Centos!"</h3>
<img src="_images/boycrying.jpg" alt=""/>
</section>
<section>
<h3>"Eu mantenho uma aplicação Python 2.6!"</h3>
<img src="_images/crying-on-sofa1.gif" alt=""/>
</section>
<section>
<h1>Six ao resgate!</h1>
<h2 class="fragment">e seu fiel companheiro <code>__future__</code>!</h2>
<h3 class="fragment">...mas apenas para aqueles com Python 2.7.</h3>
</section>
<section>
<h2>Exemplo <span class="fragment">(estúpido)</span></h2>
<pre><code class='python'>import collections
class Model(object): class Model(object):
def __init__(self, word): def __init__(self, word):
@ -155,177 +172,234 @@ class Model(object):
def word(self, word): def word(self, word):
self._word = word self._word = word
self._count = collections.Counter(word)</code></pre> self._count = collections.Counter(word)</code></pre>
</section> </section>
<section> <section>
<pre><code> <pre><code class='python'>
@property @property
def letters(self): def letters(self):
return self._count return self._count
def __getitem__(self, pos): def __getitem__(self, pos):
return self._count[pos] return self._count[pos]
</code></pre> </code></pre>
</section> </section>
<section> <section>
<pre><code> <pre><code class='python'>
if __name__ == "__main__": if __name__ == "__main__":
word = Model('This is an ex-parrot') word = Model('This is an ex-parrot')
for letter, count in word.letters.iteritems(): for letter, count in word.letters.iteritems():
print letter, count print letter, count
</code></pre> </code></pre>
</section> </section>
<section>
<h2>E Python 3?</h2>
<p><code>class Model(object):</code></p> <section>
<h2>E Python 3?</h2>
<p>Todas as classes são new style, mas Python 3 não <p><code>class Model(object):</code></p>
reclama disso.</p>
</section>
<section> <p>Todas as classes são new style, mas Python 3 não
<h2>E Python 3?</h2> reclama disso.</p>
</section>
<p><code>for letter, count in word.letters.iteritems():</code></p> <section>
<p><code>iteritems()</code> não existe mais no Python 3.</p> <h2>E Python 3?</h2>
<p class="fragment">Python 3 tem apenas <code>items()</code>,
que funciona de forma diferente no Python 2.</p> <p><code>for letter, count in word.letters.iteritems():</code></p>
<p class="fragment"><code>items()</code> no Python 2 gera uma <p><code>iteritems()</code> não existe mais no Python 3.</p>
lista inteira nova ao invés de ser um iterador.</p> <p class="fragment">Python 3 tem apenas <code>items()</code>,
</section> que funciona de forma diferente no Python 2.</p>
<p class="fragment"><code>items()</code> no Python 2 gera uma
lista inteira nova ao invés de ser um iterador.</p>
</section>
<section> <section>
<h2>E Python 3?</h2> <h2>E Python 3?</h2>
<p><code>print letter, count</code></p> <p><code>print letter, count</code></p>
<p><code>print</code> agora é uma função.</p> <p><code>print</code> agora é uma função.</p>
<p>Algumas funcionalidades mudaram (por exemplo, não há <p>Algumas funcionalidades mudaram (por exemplo, não há
mais espaço entre itens).</p> mais espaço entre itens).</p>
</section> </section>
</section> </section>
<section> <section>
<section> <section>
<h2>Compatível entre 2 e 3</h2> <h2>Compatível entre 2 e 3</h2>
<pre><code> <pre><code>
class Model(object): class Model(object):
</code></pre> </code></pre>
<p class="fragment">Não precisa fazer nada.</p> <p class="fragment">Não precisa fazer nada.</p>
</section> </section>
<section> <section>
<h2>Compatível entre 2 e 3</h2> <h2>Compatível entre 2 e 3</h2>
<pre><code> <pre><code>
print letter, count print letter, count
</code></pre> </code></pre>
<pre class="fragment"><code> <pre class="fragment"><code>
from __future__ import print_function from __future__ import print_function
[...] [...]
print('{} {}'.format(letter, count)) print('{} {}'.format(letter, count))
</code></pre> </code></pre>
</section> </section>
<section> <section>
<h2>Compatível entre 2 e 3</h2> <h2>Compatível entre 2 e 3</h2>
<h3>(sugestão)</h3> <h3>(sugestão)</h3>
<pre><code> <pre><code class='python'>
print('{letter} {count}'.format(letter=letter, print('{letter} {count}'.format(letter=letter,
count=count)) count=count))
</code></pre> </code></pre>
<aside class="notes"> <aside class="notes">
Use os nomes das variáveis no print para Use os nomes das variáveis no print para
evitar confusões sem contar que agora a evitar confusões sem contar que agora a
ordem dos parâmetros não precisa mais ordem dos parâmetros não precisa mais
seguir a ordem do print. seguir a ordem do print.
</aside> </aside>
</section> </section>
<section> <section>
<h2>Compatível entre 2 e 3</h2> <h2>Compatível entre 2 e 3</h2>
<h3>(sugestão mais melhor ainda)</h3> <h3>(sugestão mais melhor ainda)</h3>
<pre><code> <pre><code class='python'>
import six import six
[...] [...]
six.print_('{letter} {count}'.format(letter=letter, six.print_('{letter} {count}'.format(letter=letter,
count=count)) count=count))
</code></pre> </code></pre>
<aside class="notes"> <aside class="notes">
six.print_ é recomendado se tu não pode sequer rodar six.print_ é recomendado se tu não pode sequer rodar
Python 2.7 (mas por favor, né?) Python 2.7 (mas por favor, né?)
</aside> </aside>
</section> </section>
<section> <section>
<h2>Compatível entre 2 e 3</h2> <h2>Compatível entre 2 e 3</h2>
<pre><code> <pre><code class='python'>
for letter, count in word.letters.iteritems(): for letter, count in word.letters.iteritems():
</code></pre> </code></pre>
<pre class="fragment"><code> <pre class="fragment"><code>
import six import six
[...] [...]
for letter, count in six.iteritems(word.letters): for letter, count in six.iteritems(word.letters):
</code></pre> </code></pre>
</section> </section>
<section> <section>
<h2><span class="happy">&#x1F389;</span> Parabéns! <span class="happy">&#x1F389;</span></h2> <h2><span class="happy">&#x1F389;</span> Parabéns! <span class="happy">&#x1F389;</span></h2>
<h3>Seu código roda em Python 2 <i>E</i> Python 3!</h3> <h3>Seu código roda em Python 2 <i>E</i> Python 3!</h3>
<p class="fragment">... o código era estúpido mesmo...</p> <p class="fragment">... o código era estúpido mesmo...</p>
</section> </section>
</section>
<section>
<section>
<h2>Exemplo 2<span class="fragment"> (real)</span></h2>
<pre><code class="python">import urllib
import urlparse
def add_querystring(url, querystring, value):
frags = list(urlparse.urlsplit(url))
query = frags[3]
query_frags = urlparse.parse_qsl(query)
query_frags.append((querystring, value))
frags[3] = urllib.urlencode(query_frags)
return urlparse.urlunsplit(frags)
if __name__ == "__main__":
print add_querystring('http://python.org', 'doc', 'urllib')
print add_querystring('http://python.org?doc=urllib',
'page', '2')</code></pre>
</section>
<section>
<h2>E Python 3?</h2>
<p><code>urlparse</code> foi "juntada" com <code>urllib</code>.</p>
<p>Coisas da <code>urllib</code> mudaram de lugar.</p>
</section>
<section>
<h2>Compatível entre 2 e 3</h2>
<pre><code class="python">import six
def add_querystring(url, querystring, value):
frags = list(six.moves.urllib.parse.urlsplit(url))
query = frags[3]
query_frags = six.moves.urllib.parse.parse_qsl(query)
query_frags.append((querystring, value))
frags[3] = six.moves.urllib.parse.urlencode(query_frags)
return six.moves.urllib.parse.urlunsplit(frags)
if __name__ == "__main__":
six.print_(add_querystring('http://python.org', 'doc', 'urllib'))
six.print_(add_querystring('http://python.org?doc=urllib',
'page', '2'))</code></pre>
</section>
</section>
<section data-background='_images/thats-all-folks.jpg'>
<section>
<h1 class="fragment semi-opaque">Perguntas?</h1>
<p class="fragment semi-opaque">E antes que alguém pergunte,
é 2 <strong>*</strong>3, não 2 <strong>+</strong>3.</p>
</section>
</section> </section>
</div> </div>
</div> </div>
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