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<title>Python 3.6 - Novidades da Versão</title>
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<h1>Python 3.6</h1>
<h2>Novidades da versão</h2>
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<section>
<img src="_images/AYV1X0yv.png" alt="Me" style="float:left;height:200px;" class="no-border">
<div>
<ul class='empty'>
<li>Júlio Biason</li>
<li><img src="_images/logo-horizontal-claro.png" alt="CWI Software" class='no-border'>
<li>@juliobiason</li>
<li>julio.biason@gmail.com</li>
<li><a href="http://presentations.juliobiason.net">http://presentations.juliobiason.net</a></li>
</ul>
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<section>
<img src="_images/python36-new.png" alt="A full screenshot of the changes in Python 3.6" height="300px"/>
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<section>
<img src="_images/london-ripper.jpg" alt="Vamos por partes"/>
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<img src="_images/neat.jpg" alt="Neat."/>
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<img src="_images/my_opinion.jpg" alt="My opinion"/>
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<section>
<h2>Underscores em números</h2>
<pre><code class="python">>>> 1_000_000_000 == 1000000000
True</code></pre>
<pre class="fragment"><code class="python">>>> 1_00_00_00_00_0</code></pre>
<pre class="fragment"><code class="python">>>> '{:_}'.format(1000000)
'1_000_000'</code></pre>
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<section>
<h2>String literals</h2>
<pre><code class="python">>>> name = 'Julio'
>>> f'My name is {name}'
My name is Julio</code></pre>
<pre class="fragment"><code class="python">>>> def f():
... name = 'Julio'
... print('My name is {name}'.format(**locals()))</code></pre>
</section>
<section>
<pre><code class="python">
all(list(print(f'{i} bottle{"s" if i != 1 else ""} of '
f'beer on the wall, {str(i).lower()} '
f'bottle{"s" if i != 1 else ""} of beer.\n{"Take one '
f'down pass it around" if str(i).lower() == str(i) '
f'else "Go to the store and buy some more"}, '
f'{i-1 if i not in [1, "No more"] else "no more" '
f'if i == 1 else 99} bottles of beer on the wall.\n') \
for i in list(range(99, 0, -1))+['No more'])) \
or ""
</code></pre>
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<section>
<section>
<h2>Type annotations</h2>
<p>Só pra lembrar...</p>
<pre><code class="python">>>> def(name: str) -> str:
... return 'Hello ' + name</code></pre>
<p class="fragment">
Não signfica que o CPython valida o parâmetro ou o retorno.
</p>
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<section>
<pre><code class="python">>>> captain: str # mas continua como undefined</code></pre>
<pre><code class="python">>>> values: List[int] = [1, 2, 4]</code></pre>
<p class="fragment">Essas informações podem ser extraídas de <code>__annotations__</code>
(assim como docstrings podem ser extraídas de <code>__doc__</code>).</p>
</section>
</section>
<section>
<section>
<h2>secrets</h2>
<p>Nova biblioteca para geração de números randômicos "fortes", utilizados
para criptografia.</p>
<pre><code class="python">>>> token_hex(16)
'f9bf78b9a18ce6d46a0cd2b0b86df9da'</code></pre>
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<section>
<h2>enum</h2>
<p>Novo tipo <code>auto</code> para gerar número automaticamente.
</p>
<pre><code class="python">>>> from enum import Enum, auto
>>> class Color(Enum):
... red = auto()
... blue = auto()
... green = auto()
...
>>> list(Color)
[<<Color.red: 1>, <Color.blue: 2>, <Color.green: 3>]</code></pre>
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<section>
<h2>importlib</h2>
<p>Ao tentar importar um módulo que não existe, será gerado
<code>ModuleNotFoundError</code> ao invés de
<code>ImportError</code>.</p>
</section>
</section>
<section>
<section>
<h2>Pathlib</h2>
<p>Representação de um caminho qualquer no sistema de arquivos.</p>
<pre><code class="python">>>> import pathlib
>>> with open(pathlib.Path("README")) as f:
... contents = f.read()
...
>>> import os.path
>>> os.path.splitext(pat)
('some_file', '.txt')</code></pre>
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<section>
<p>Nova função para tornar objetos Path-like: <code>__fspath()__</code></p>
</section>
</section>
<section>
<section>
<h2>Novos "dicionários"</h2>
<p><code>dict</code> agora é mais compacto.</p>
<p class="fragment">Efeito colateral: agora são ordenados em CPython,
mas não no spec da linguagem Python.</p>
</section>
<section>
<ul>
<li><code>**kwargs</code> agora são ordenados.</li>
<li><code>__dict__</code> agora é ordenado.</li>
</ul>
</section>
</section>
<section>
<section>
<h2>Async the world!</h2>
<p><code>asyncio</code> agora é oficial.</p>
</section>
<section>
<h3>Async generators</h3>
<pre><code class="python">async def ticker(delay, to):
"""Yield numbers from 0 to *to* every *delay* seconds."""
for i in range(to):
yield i
await asyncio.sleep(delay)</code></pre>
</section>
<section>
<h3>Async comprehensions</h3>
<pre><code class="python">result = [i async for i in aiter() if i % 2]</code></pre>
<pre><code class="python">result = [await fun() for fun in funcs if await condition()]</code></pre>
</section>
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<section>
<h2>Last but not least</h2>
<ul>
<li>Customização de classes com <code>__init_subclass__()</code>;</li>
<li>Suporte a DTrace e SystemTrap;</li>
<li>Variável de ambiente para mudar a forma de alocação de memória e mudanças
no módulo <code>tracemalloc</code>;</li>
<li>Desambiguação de datas com entrada do horário de verão;</li>
<li><code>typing</code> com novidades;</li>
</ul>
</section>
<section>
<ul>
<li><code>os.urandom()</code> vai bloquear até que haja entropia suficiente
para gerar um número;</li>
<li>Suporte a OpenSSL 1.1.0;</li>
<li>Novos métodos criptográficos em <code>hashlib</code>;</li>
<li>Sistema de arquivos do Windows agora é considerado UTF-8;</li>
<li>Facilidades para definir o PATH das bibliotecas com arquivos
._pth.</li>
</ul>
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