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<section>
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<section>
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<h1>Python 2 + 3 = Six</h1>
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</section>
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</section>
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<section>
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<section>
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<img src="_images/AYV1X0yv.png" alt="Me" style="float:left;">
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<div>
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<ul>
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<li>Júlio Biason</li>
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<li>CWI Software</li>
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<li>@juliobiason</li>
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<li>julio.biason@gmail.com</li>
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</ul>
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</div>
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</section>
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</section>
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<section>
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<section>
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<h2>Por que Python 3?</h2>
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<ul>
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<li>Unicode por padrão <span class="frament">(adeus UnicodeDecodeError)</span></li>
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<li class="fragment">AsyncIO</li>
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<li class="fragment">SUPORTE AO PYTHON 2 TERMINA EM 2020!</li>
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</ul>
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</section>
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<section>
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<img src="_images/bigstock-decorated-christmas-tree-close-76005554-1.jpg" style='float:left;' width="20%">
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<img src='_images/carna-index-04.jpg' class="fragment" width="20%">
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<img src="_images/2020.jpg" style='float:right;' class="fragment", width="20%">
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</section>
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</section>
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<section>
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<section>
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<h2>Caminho para o Python 3</h2>
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<ul>
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<li><code>python -3 [script]</code></li>
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<li><code>2to3</code></li>
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</ul>
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</section>
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<section>
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<h2>O que <code>2to3</code> arruma</h2>
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<ul>
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<li><code>print</code> não vai funcionar (é função)</li>
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<li><code>iter*</code> não vai funcionar</li>
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<li><code>urlib</code> mudou tudo</li>
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<li><code>urlparse</code> mudou tudo</li>
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</ul>
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<p class="fragment">(<code>%</code> para formatar strings
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retornou, <code>2to3</code> não muda para <code>format()</code>)</p>
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</section>
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</section>
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<section>
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<section>
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<h3>"Mais minha infra usa Centos 4 e não tem Python 3 pra Centos!"</h3>
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<img src="_images/boycrying.jpg" alt=""/>
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</section>
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<section>
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<h1>Six ao resgate!</h1>
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<h2 class="fragment">e seu fiel companheiro <code>__future__</code>!</h2>
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</section>
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<section>
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<h2>Exemplo <span class="fragment">(estúpido)</span></h2>
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<pre><code class="hljs python">import collections
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class Model(object):
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def __init__(self, word):
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self._count = None
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self.word = word
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return
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@property
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def word(self):
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return self._word
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@word.setter
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def word(self, word):
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self._word = word
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self._count = collections.Counter(word)</code></pre>
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</section>
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<section>
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<pre><code class="hljs python">
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@property
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def letters(self):
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return self._count
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def __getitem__(self, pos):
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return self._count[pos]
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</code></pre>
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</section>
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<section>
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<pre><code class="hljs python">
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if __name__ == "__main__":
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word = Model('This is an ex-parrot')
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for letter, count in word.letters.iteritems():
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print letter, count
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</code></pre>
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</section>
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<section>
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<h2>E Python 3?</h2>
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<p><code>class Model(object):</code></p>
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<p>Todas as classes são new style, mas Python 3 não
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reclama disso.</p>
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</section>
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<section>
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<h2>E Python 3?</h2>
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<p><code>for letter, count in word.letters.iteritems():</code></p>
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<p><code>iteritems()</code> não existe mais no Python 3.</p>
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<p class="fragment">Python 3 tem apenas <code>items()</code>,
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que funciona de forma diferente no Python 2.</p>
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<p class="fragment"><code>items()</code> no Python 2 gera uma
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lista inteira nova ao invés de ser um iterador.</p>
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</section>
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<section>
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<h2>E Python 3?</h2>
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<p><code>print letter, count</code></p>
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<p><code>print</code> agora é uma função.</p>
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<p>Algumas funcionalidades mudaram (por exemplo, não há
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mais espaço entre itens).</p>
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</section>
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</section>
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