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325 lines
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325 lines
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<title>Python 3.6 - Novidades da Versão</title> |
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<meta name="author" content="Hakim El Hattab"> |
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<div class="slides"> |
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<section> |
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<section data-background='_images/python.jpg' data-header> |
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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="https://presentations.juliobiason.me">https://presentations.juliobiason.me</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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