more six

python23six.html

@@ -58,25 +58,132 @@
 				</section>
 
 				<section>
-					<h2>Por que Python 3?</h2>
+					<section>
-
+						<h2>Por que Python 3?</h2>
-					<img src="_images/bigstock-decorated-christmas-tree-close-76005554-1.jpg"
+
-					   style='float:left;'
+						<ul>
-					   class="fragment",
+							<li>Unicode por padrão <span class="frament">(adeus UnicodeDecodeError)</span></li>
-					   width="20%">
+							<li class="fragment">AsyncIO</li>
-				    <img src='_images/carna-index-04.jpg'
+							<li class="fragment">SUPORTE AO PYTHON 2 TERMINA EM 2020!</li>
-					   class="fragment"
+						</ul>
-					   width="20%">
+					</section>
-					<img src="_images/2020.jpg"
+
-					   style='float:right;'
+					<section>
-					   class="fragment",
+						<img src="_images/bigstock-decorated-christmas-tree-close-76005554-1.jpg" style='float:left;' width="20%">
-					   width="20%">
+						<img src='_images/carna-index-04.jpg' class="fragment" width="20%">
-				    </p>
+						<img src="_images/2020.jpg" style='float:right;' class="fragment", width="20%">
+					</section>
 				</section>
 
+				<section>
+					<section>
+						<h2>Caminho para o Python 3</h2>
 
-			</div>
+						<ul>
+							<li><code>python -3 [script]</code></li>
+							<li><code>2to3</code></li>
+						</ul>
+					</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>
+						</ul>
+
+						<p class="fragment">(<code>%</code> para formatar strings
+						retornou, <code>2to3</code> não muda para <code>format()</code>)</p>
+					</section>
+				</section>
+
+				<section>
+					<section>
+						<h3>"Mais minha infra usa Centos 4 e não tem Python 3 pra Centos!"</h3>
+						<img src="_images/boycrying.jpg" alt=""/>
+					</section>
+
+					<section>
+						<h1>Six ao resgate!</h1>
+
+						<h2 class="fragment">e seu fiel companheiro <code>__future__</code>!</h2>
+					</section>
 
+					<section>
+						<h2>Exemplo <span class="fragment">(estúpido)</span></h2>
+						<pre><code class="hljs python">import collections
+
+class Model(object):
+    def __init__(self, word):
+        self._count = None
+        self.word = word
+        return
+
+    @property
+    def word(self):
+        return self._word
+
+    @word.setter
+    def word(self, word):
+        self._word = word
+        self._count = collections.Counter(word)</code></pre>
+					</section>
+
+					<section>
+						<pre><code class="hljs python">
+    @property
+    def letters(self):
+        return self._count
+
+    def __getitem__(self, pos):
+        return self._count[pos]
+						</code></pre>
+					</section>
+
+					<section>
+						<pre><code class="hljs python">
+if __name__ == "__main__":
+    word = Model('This is an ex-parrot')
+    for letter, count in word.letters.iteritems():
+        print letter, count
+						</code></pre>
+					</section>
+
+					<section>
+						<h2>E Python 3?</h2>
+
+						<p><code>class Model(object):</code></p>
+						
+						<p>Todas as classes são new style, mas Python 3 não
+							reclama disso.</p>
+					</section>
+
+					<section>
+						<h2>E Python 3?</h2>
+
+						<p><code>for letter, count in word.letters.iteritems():</code></p>
+						<p><code>iteritems()</code> não existe mais no Python 3.</p>
+						<p class="fragment">Python 3 tem apenas <code>items()</code>,
+							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>
+						<h2>E Python 3?</h2>
+
+						<p><code>print letter, count</code></p>
+
+						<p><code>print</code> agora é uma função.</p>
+
+						<p>Algumas funcionalidades mudaram (por exemplo, não há
+							mais espaço entre itens).</p>
+					</section>
+				</section>
+			</div>
 		</div>
 
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