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class="sidebar-link">Common Pitfalls</a></li><li><a href="/python/hidden-features.html" class="sidebar-link">Hidden Features</a></li><li><a href="/python/date-formatting.html" class="sidebar-link">Date Formatting</a></li><li><a href="/python/ijson.html" class="sidebar-link">ijson</a></li><li><a href="/python/django.html" class="sidebar-link">Django</a></li><li><a href="/python/code-blocks-execution-frames-and-namespaces.html" class="sidebar-link">Code blocks, execution frames, and namespaces</a></li><li><a href="/python/contributors.html" class="sidebar-link">The Contributors</a></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="flask"><a href="#flask" class="header-anchor">#</a> Flask</h1> <p>Flask is a Python micro web framework used to run major websites including Pintrest, Twilio, and Linkedin. This topic explains and demonstrates the variety of features Flask offers for both front and back end web development.</p> <h2 id="files-and-templates"><a href="#files-and-templates" class="header-anchor">#</a> Files and Templates</h2> <p>Instead of typing our HTML markup into the return statements, we can use the <code>render_template()</code> function:</p> <div class="language-py extra-class"><pre class="language-py"><code><span class="token keyword">from</span> flask <span class="token keyword">import</span> Flask
<span class="token keyword">from</span> flask <span class="token keyword">import</span> render_template
app <span class="token operator">=</span> Flask<span class="token punctuation">(</span>__name__<span class="token punctuation">)</span>
<span class="token decorator annotation punctuation">@app<span class="token punctuation">.</span>route</span><span class="token punctuation">(</span><span class="token string">"/about"</span><span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">about</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
<span class="token keyword">return</span> render_template<span class="token punctuation">(</span><span class="token string">"about-us.html"</span><span class="token punctuation">)</span>
<span class="token keyword">if</span> __name__ <span class="token operator">==</span> <span class="token string">"__main__"</span><span class="token punctuation">:</span>
app<span class="token punctuation">.</span>run<span class="token punctuation">(</span>host<span class="token operator">=</span><span class="token string">"0.0.0.0"</span><span class="token punctuation">,</span> port<span class="token operator">=</span><span class="token number">80</span><span class="token punctuation">,</span> debug<span class="token operator">=</span><span class="token boolean">True</span><span class="token punctuation">)</span>
</code></pre></div><p>This will use our template file <code>about-us.html</code>. To ensure our application can find this file we must organize our directory in the following format:</p> <div class="language-py extra-class"><pre class="language-py"><code><span class="token operator">-</span> application<span class="token punctuation">.</span>py
<span class="token operator">/</span>templates
<span class="token operator">-</span> about<span class="token operator">-</span>us<span class="token punctuation">.</span>html
<span class="token operator">-</span> login<span class="token operator">-</span>form<span class="token punctuation">.</span>html
<span class="token operator">/</span>static
<span class="token operator">/</span>styles
<span class="token operator">-</span> about<span class="token operator">-</span>style<span class="token punctuation">.</span>css
<span class="token operator">-</span> login<span class="token operator">-</span>style<span class="token punctuation">.</span>css
<span class="token operator">/</span>scripts
<span class="token operator">-</span> about<span class="token operator">-</span>script<span class="token punctuation">.</span>js
<span class="token operator">-</span> login<span class="token operator">-</span>script<span class="token punctuation">.</span>js
</code></pre></div></div> <footer class="page-edit"><div class="edit-link"><a href="https://github.com/devtut/generate/edit/master/docs/python/flask.md" target="_blank" rel="noopener noreferrer">Edit this page on GitHub</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <!----></footer> <div class="page-nav"><p class="inner"><span class="prev">
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