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<title>Python 3.6 - Novidades da Versão</title>
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<body>
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<div class="reveal">
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<div class="slides">
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<section>
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<section data-background='_images/python.jpg'>
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<div class="semi-opaque">
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<h1>Python 3.6</h1>
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<h2>Novidades da versão</h2>
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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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<img src="_images/AYV1X0yv.png" alt="Me" style="float:left;height:200px;" class="no-border">
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<div>
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<ul class='empty'>
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<li>Júlio Biason</li>
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<li><img src="_images/logo-horizontal-claro.png" alt="CWI Software" class='no-border'>
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<li>@juliobiason</li>
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<li>julio.biason@gmail.com</li>
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<li><a href="http://presentations.juliobiason.net">http://presentations.juliobiason.net</a></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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<img src="_images/python36-new.png" alt="A full screenshot of the changes in Python 3.6" height="300px"/>
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</section>
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<section>
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<img src="_images/london-ripper.jpg" alt="Vamos por partes"/>
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</section>
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<section>
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<img src="_images/neat.jpg" alt="Neat."/>
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</section>
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<section>
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<img src="_images/my_opinion.jpg" alt="My opinion"/>
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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>Underscores em números</h2>
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<pre><code class="python">>>> 1_000_000_000 == 1000000000
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True</code></pre>
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<pre class="fragment"><code class="python">>>> 1_00_00_00_00_0</code></pre>
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<pre class="fragment"><code class="python">>>> '{:_}'.format(1000000)
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'1_000_000'</code></pre>
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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>String literals</h2>
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<pre><code class="python">>>> name = 'Julio'
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>>> f'My name is {name}'
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My name is Julio</code></pre>
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<pre class="fragment"><code class="python">>>> def f():
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... name = 'Julio'
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... print('My name is {name}'.format(**locals()))</code></pre>
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</section>
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<section>
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<pre><code class="python">
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all(list(print(f'{i} bottle{"s" if i != 1 else ""} of '
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f'beer on the wall, {str(i).lower()} '
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f'bottle{"s" if i != 1 else ""} of beer.\n{"Take one '
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f'down pass it around" if str(i).lower() == str(i) '
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f'else "Go to the store and buy some more"}, '
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f'{i-1 if i not in [1, "No more"] else "no more" '
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f'if i == 1 else 99} bottles of beer on the wall.\n') \
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for i in list(range(99, 0, -1))+['No more'])) \
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or ""
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</code></pre>
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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>Type annotations</h2>
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<p>Só pra lembrar...</p>
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<pre><code class="python">>>> def(name: str) -> str:
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... return 'Hello ' + name</code></pre>
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<p class="fragment">
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Não signfica que o CPython valida o parâmetro ou o retorno.
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</p>
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</section>
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<section>
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<pre><code class="python">>>> captain: str # mas continua como undefined</code></pre>
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<pre><code class="python">>>> values: List[int] = [1, 2, 4]</code></pre>
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<p class="fragment">Essas informações podem ser extraídas de <code>__annotations__</code>
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(assim como docstrings podem ser extraídas de <code>__doc__</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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<h2>secrets</h2>
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<p>Nova biblioteca para geração de números randômicos "fortes", utilizados
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para criptografia.</p>
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<pre><code class="python">>>> token_hex(16)
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'f9bf78b9a18ce6d46a0cd2b0b86df9da'</code></pre>
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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>enum</h2>
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<p>Novo tipo <code>auto</code> para gerar número automaticamente.
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</p>
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<pre><code class="python">>>> from enum import Enum, auto
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>>> class Color(Enum):
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... red = auto()
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... blue = auto()
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... green = auto()
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...
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>>> list(Color)
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[<<Color.red: 1>, <Color.blue: 2>, <Color.green: 3>]</code></pre>
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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>importlib</h2>
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<p>Ao tentar importar um módulo que não existe, será gerado
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<code>ModuleNotFoundError</code> ao invés de
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<code>ImportError</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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<h2>Pathlib</h2>
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<p>Representação de um caminho qualquer no sistema de arquivos.</p>
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<pre><code class="python">>>> import pathlib
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>>> with open(pathlib.Path("README")) as f:
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... contents = f.read()
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...
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>>> import os.path
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>>> os.path.splitext(pat)
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('some_file', '.txt')</code></pre>
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</section>
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<section>
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<p>Nova função para tornar objetos Path-like: <code>__fspath()__</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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<h2>Novos "dicionários"</h2>
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<p><code>dict</code> agora é mais compacto.</p>
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<p class="fragment">Efeito colateral: agora são ordenados em CPython,
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mas não no spec da linguagem Python.</p>
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</section>
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<section>
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<ul>
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<li><code>**kwargs</code> agora são ordenados.</li>
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<li><code>__dict__</code> agora é ordenado.</li>
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</ul>
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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>Async the world!</h2>
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<p><code>asyncio</code> agora é oficial.</p>
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</section>
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<section>
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<h3>Async generators</h3>
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<pre><code class="python">async def ticker(delay, to):
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"""Yield numbers from 0 to *to* every *delay* seconds."""
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for i in range(to):
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yield i
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await asyncio.sleep(delay)</code></pre>
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</section>
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<section>
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<h3>Async comprehensions</h3>
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<pre><code class="python">result = [i async for i in aiter() if i % 2]</code></pre>
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<pre><code class="python">result = [await fun() for fun in funcs if await condition()]</code></pre>
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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>Last but not least</h2>
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<ul>
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<li>Customização de classes com <code>__init_subclass__()</code>;</li>
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<li>Suporte a DTrace e SystemTrap;</li>
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<li>Variável de ambiente para mudar a forma de alocação de memória e mudanças
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no módulo <code>tracemalloc</code>;</li>
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<li>Desambiguação de datas com entrada do horário de verão;</li>
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<li><code>typing</code> com novidades;</li>
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</ul>
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</section>
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<section>
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<ul>
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<li><code>os.urandom()</code> vai bloquear até que haja entropia suficiente
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para gerar um número;</li>
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<li>Suporte a OpenSSL 1.1.0;</li>
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<li>Novos métodos criptográficos em <code>hashlib</code>;</li>
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<li>Sistema de arquivos do Windows agora é considerado UTF-8;</li>
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<li>Facilidades para definir o PATH das bibliotecas com arquivos
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._pth.</li>
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</ul>
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</section>
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</section>
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</div>
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</div>
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<script src="reveal.js/lib/js/head.min.js"></script>
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<script src="reveal.js/js/reveal.js"></script>
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<script>
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// Full list of configuration options available at:
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// https://github.com/hakimel/reveal.js#configuration
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Reveal.initialize({
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controls: true,
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// showNotes: true,
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transition: 'slide', // none/fade/slide/convex/concave/zoom
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// Optional reveal.js plugins
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dependencies: [
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{ src: 'reveal.js/lib/js/classList.js', condition: function() { return !document.body.classList; } },
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{ src: 'reveal.js/plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
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{ src: 'reveal.js/plugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
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</body>
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</html>
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