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<title>Pylint, Warnings e Correções</title>
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<meta name="author" content="Julio Biason">
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font-size: 150%
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</style>
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</head>
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<body>
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<div class="reveal">
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<!-- Any section element inside of this container is displayed as a slide -->
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<div class="slides">
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<section data-background='_images/pylint.png' class='semi-opaque'>
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<h1>Pylint, Warnings e Correções</h1>
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</section>
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<section>
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<section>
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<h2><code>missing-docstring</code></h2>
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</section>
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<section>
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<h2>O que é o erro</h2>
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<div class='code'>
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<p><pre><code data-trim class='python'>
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def funcao(valor):
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return valor * 2
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</code></pre></p>
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</div>
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</section>
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<section>
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<h2>Solução</h2>
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<p>Documente suas funções!</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><code>wildcard-import</code></h2>
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</section>
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<section>
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<h2>O que é o erro</h2>
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<div class='code'>
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<p><pre><code data-trim class='python'>
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from module import *
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</code></pre></p>
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</div>
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</section>
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<section>
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<h2>Solução</h2>
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<p>Importe apenas as funções módulos que são usados.</p>
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</section>
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<section>
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<h2>Por que não usar "import *"</h2>
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<ul>
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<li>O módulo pode ter código não protegido por
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função, classe ou <code>if __name__ == '__main__'</code></li>
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<li>Poluíção do namespace.</li>
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<li>Módulo pode redefinir uma função presente no
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módulo atual.</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><code>unused-import</code></h2>
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</section>
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<section>
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<h2>O que é o erro</h2>
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<div class='code'>
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<p><pre><code data-trim class='python'>
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from module import function
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</code></pre></p>
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</div>
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<p>(E <code>function()</code> não é usado em lugar algum.)</p>
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</section>
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<section>
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<h2>Solução</h2>
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<p>Remova o import.</p>
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</section>
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<section>
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<h2>Dica!</h2>
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<p>Quebrar imports em várias linhas facilita correção desse
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tipo de problema.</p>
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<div class='code'>
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<p><pre><code data-trim class='python'>
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from module import func1
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from module import func2
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</pre></code></p>
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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><code>unused-argument</code></h2>
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</section>
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<section>
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<h2>O que é o erro</h2>
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<div class='code'>
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<p><pre><code data-trim>
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def func(arg1, arg2):
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return arg1 * 2
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</pre></code></p>
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</div>
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</section>
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<section>
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<h2>Solução</h2>
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<ul>
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<li>Remova o parâmetro desnecessário</li>
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<li>Altere o parâmetro para "_"</li>
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</ul>
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</section>
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<section>
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<h2>Corner case</h2>
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<div class='code'>
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<p><pre><code data-trim class='python'>
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def addSeven(foo): # "Unused argument 'foo'"
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foo += [7]
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</code></pre></p>
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</div>
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<p>O problema é a questão de referência para objetos
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mutáveis. O código em si está errado.</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><code>bare-except</code></h2>
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</section>
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<section>
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<h2>O que é o erro</h2>
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<div class='code'>
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<p><pre><code data-trim class='python'>
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try:
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func()
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except Exception e:
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pass
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</code></pre></p>
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</div>
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</section>
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<section>
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<h2>Solução</h2>
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<p>Capture apenas as exceções que você sabe lidar.</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><code>no-self-use</code></h2>
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</section>
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<section>
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<h2>O que é o erro</h2>
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<div class='code'>
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<p><pre><code data-trim class='python'>
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class A(object):
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def func(self, a):
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return a * 2
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</code></pre></p>
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</div>
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</section>
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<section>
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<h2>Solução</h2>
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<p>A solução mais "correta" é tirar a função da classe e deixar
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fora do objeto.</p>
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<p class='fragment'>Não sendo possível,
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<code># pylint:disable=no-self-use</code> antes da função.
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</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><code>old-style-class</code></h2>
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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><code>super-on-old-class</code></h2>
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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><code>no-init</code></h2>
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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><code>super-init-not-called</code></h2>
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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><code>attribute-defined-outside-init</code></h2>
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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><code>abstract-method</code></h2>
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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><code>arguments-differ</code></h2>
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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><code>no-member</code> e <code>maybe-no-member</code></h2>
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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><code>no-value-for-parameter</code></h2>
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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><code>protected-access</code></h2>
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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><code>too-few-public-methods</code></h2>
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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><code>too-many-ancestors</code></h2>
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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><code>too-many-arguments</code></h2>
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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><code>too-many-branches</code></h2>
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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><code>too-many-instance-attributes</code></h2>
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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><code>too-many-lines</code></h2>
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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><code>too-many-locals</code></h2>
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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><code>too-many-public-methods</code></h2>
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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><code>too-many-statements</code></h2>
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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><code>invalid-name</code></h2>
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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><code>star-args</code></h2>
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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="_external/head.min.js"></script>
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<script src="_external/reveal.min.js"></script>
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<script>
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// Full list of configuration options available here:
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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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progress: true,
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history: true,
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center: true,
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theme: 'night',
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transition: 'linear',
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// Optional libraries used to extend on reveal.js
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dependencies: [
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{ src: '_external/classList.js', condition: function() { return !document.body.classList; } },
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{ src: '_external/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
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{ src: '_external/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
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{ src: '_external/highlight.js', async: true, callback: function() { hljs.initHighlightingOnLoad(); } },
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{ src: '_external/zoom.js', async: true, condition: function() { return !!document.body.classList; } },
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{ src: '_external/notes.js', async: true, condition: function() { return !!document.body.classList; } }
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]
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});
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</script>
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</body>
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</html>
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<!-- vim:set et ts=4 sts=4 st=4: >
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