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class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">OpenBB Platform</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/platform/development"><span itemprop="name">Development</span></a><meta itemprop="position" content="2"></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Developer Guidelines</span><meta itemprop="position" content="3"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">OBBject Extensions</span><meta itemprop="position" content="4"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_bxCs"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>OBBject Extensions</h1></header><p>As mentioned, OpenBB provides some basic methods for interacting with common data structures that will be seen in the results attribute.
If you are working with custom data, or adding new endpoints, it is possible that you will want to have your own methods for interacting with the data.
The OpenBB Platform provides a way to do this by extending the OBBject class.
The architecture for extensions was designed similar to how extensions and accessors are done in pandas, and relies on plugins through the poetry dependency management package.</p><p>This page will go through the steps of developing a simple, custom extension for the OBBject class.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="folder-structure">Folder structure<a href="#folder-structure" class="hash-link" aria-label="Direct link to Folder structure" title="Direct link to Folder structure">​</a></h3><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#9CDCFE;--prism-background-color:#1E1E1E"><div class="codeBlockContent_m3Ux"><pre tabindex="0" class="prism-code language-shell codeBlock_qGQc thin-scrollbar"><code class="codeBlockLines_p187"><span class="token-line" style="color:#9CDCFE"><span class="token plain">example</span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain">├── README.md</span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain">├── openbb_example</span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain">│ └── __init__.py</span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain">├── poetry.lock</span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain">└── pyproject.toml</span><br></span></code></pre><div class="buttonGroup_6DOT"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="writing-the-extension">Writing the extension<a href="#writing-the-extension" class="hash-link" aria-label="Direct link to Writing the extension" title="Direct link to Writing the extension">​</a></h3><p>In this example the extension code all lives inside <code>__init__.py</code>.</p><p>First we create an <code>Extension</code> class instance to tell <code>openbb-core</code> our extension name and any required credentials to be available at <code>obb.user.credentials</code>.</p><div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#9CDCFE;--prism-background-color:#1E1E1E"><div class="codeBlockContent_m3Ux"><pre tabindex="0" class="prism-code language-python codeBlock_qGQc thin-scrollbar"><code class="codeBlockLines_p187"><span class="token-line" style="color:#9CDCFE"><span class="token keyword" style="color:rgb(86, 156, 214)">from</span><span class="token plain"> openbb_core</span><span class="token punctuation" style="color:rgb(212, 212, 212)">.</span><span class="token plain">app</span><span class="token punctuation" style="color:rgb(212, 212, 212)">.</span><span class="token plain">model</span><span class="token punctuation" style="color:rgb(212, 212, 212)">.</span><span class="token plain">extension </span><span class="token keyword" style="color:rgb(86, 156, 214)">import</span><span class="token plain"> Extension</span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain">ext </span><span class="token operator" style="color:rgb(212, 212, 212)">=</span><span class="token plain"> Extension</span><span class="token punctuation" style="color:rgb(212, 212, 212)">(</span><span class="token plain">name</span><span class="token operator" style="color:rgb(212, 212, 212)">=</span><span class="token string" style="color:rgb(206, 145, 120)">&quot;example&quot;</span><span class="token punctuation" style="color:rgb(212, 212, 212)">,</span><span class="token plain"> credentials</span><span class="token operator" style="color:rgb(212, 212, 212)">=</span><span class="token punctuation" style="color:rgb(212, 212, 212)">[</span><span class="token string" style="color:rgb(206, 145, 120)">&quot;some_api_key&quot;</span><span class="token punctuation" style="color:rgb(212, 212, 212)">]</span><span class="token punctuation" style="color:rgb(212, 212, 212)">)</span><br></span></code></pre><div class="buttonGroup_6DOT"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The credentials are required if the extension uses a key for data or a service, or it can alternatively be connection information for a database, or any other information that needs to be passed to the extension.</p><p>Now we define the extension functionality. The decorator <code>@ext.obbject_accessor</code> registers an accessor in each <code>OBBject</code> that is returned when a command is executed. This accessor is just a namespace that will contain the methods defined in the decorated class.</p><p>Here, we just add a method to say hi:</p><div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#9CDCFE;--prism-background-color:#1E1E1E"><div class="codeBlockContent_m3Ux"><pre tabindex="0" class="prism-code language-python codeBlock_qGQc thin-scrollbar"><code class="codeBlockLines_p187"><span class="token-line" style="color:#9CDCFE"><span class="token decorator annotation punctuation" style="color:rgb(212, 212, 212)">@ext</span><span class="token decorator annotation punctuation" style="color:rgb(212, 212, 212)">.</span><span class="token decorator annotation punctuation" style="color:rgb(212, 212, 212)">obbject_accessor</span><span class="token plain"></span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain"></span><span class="token keyword" style="color:rgb(86, 156, 214)">class</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(78, 201, 176)">Example</span><span class="token punctuation" style="color:rgb(212, 212, 212)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain"> </span><span class="token keyword" style="color:rgb(86, 156, 214)">def</span><span class="token plain"> </span><span class="token function" style="color:rgb(220, 220, 170)">__init__</span><span class="token punctuation" style="color:rgb(212, 212, 212)">(</span><span class="token plain">self</span><span class="token punctuation" style="color:rgb(212, 212, 212)">,</span><span class="token plain"> obbject</span><span class="token punctuation" style="color:rgb(212, 212, 212)">)</span><span class="token punctuation" style="color:rgb(212, 212, 212)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain"> self</span><span class="token punctuation" style="color:rgb(212, 212, 212)">.</span><span class="token plain">_obbject </span><span class="token operator" style="color:rgb(212, 212, 212)">=</span><span class="token plain"> obbject</span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain"> </span><span class="token keyword" style="color:rgb(86, 156, 214)">def</span><span class="token plain"> </span><span class="token function" style="color:rgb(220, 220, 170)">hello</span><span class="token punctuation" style="color:rgb(212, 212, 212)">(</span><span class="token plain">self</span><span class="token punctuation" style="color:rgb(212, 212, 212)">)</span><span class="token punctuation" style="color:rgb(212, 212, 212)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain"> api_key </span><span class="token operator" style="color:rgb(212, 212, 212)">=</span><span class="token plain"> self</span><span class="token punctuation" style="color:rgb(212, 212, 212)">.</span><span class="token plain">_obbject</span><span class="token punctuation" style="color:rgb(212, 212, 212)">.</span><span class="token plain">_credentials</span><span class="token punctuation" style="color:rgb(212, 212, 212)">.</span><span class="token plain">some_api_key</span><span class="token punctuation" style="color:rgb(212, 212, 212)">.</span><span class="token plain">get_secret_value</span><span class="token punctuation" style="color:rgb(212, 212, 212)">(</span><span class="token punctuation" style="color:rgb(212, 212, 212)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain"> </span><span class="token keyword" style="color:rgb(86, 156, 214)">print</span><span class="token punctuation" style="color:rgb(212, 212, 212)">(</span><span class="token string-interpolation string" style="color:rgb(206, 145, 120)">f&quot;Hello, this is my credential: </span><span class="token string-interpolation interpolation punctuation" style="color:rgb(212, 212, 212)">{</span><span class="token string-interpolation interpolation">api_key</span><span class="token string-interpolation interpolation punctuation" style="color:rgb(212, 212, 212)">}</span><span class="token string-interpolation string" style="color:rgb(206, 145, 120)">!&quot;</span><span class="token punctuation" style="color:rgb(212, 212, 212)">)</span><br></span></code></pre><div class="buttonGroup_6DOT"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="entry-point">Entry Point<a href="#entry-point" class="hash-link" aria-label="Direct link to Entry Point" title="Direct link to Entry Point">​</a></h3><p>The <code>pyproject.toml</code> file will specify the usual setup and dependency information. Additionally, we need to include the following block:</p><div class="language-toml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#9CDCFE;--prism-background-color:#1E1E1E"><div class="codeBlockContent_m3Ux"><pre tabindex="0" class="prism-code language-toml codeBlock_qGQc thin-scrollbar"><code class="codeBlockLines_p187"><span class="token-line" style="color:#9CDCFE"><span class="token plain">[tool.poetry.plugins.&quot;openbb_obbject_extension&quot;]</span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain">example = &quot;openbb_example:ext&quot;</span><br></span></code></pre><div class="buttonGroup_6DOT"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>With this in the file, we can install the extension by running <code>poetry install</code> from the extension folder.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="using-the-extension">Using the extension<a href="#using-the-extension" class="hash-link" aria-label="Direct link to Using the extension" title="Direct link to Using the extension">​</a></h3><p>Now that the extension is installed and built, we can use it! Because we are extending the <code>OBBject</code>, this will be available on any function:</p><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#9CDCFE;--prism-background-color:#1E1E1E"><div class="codeBlockContent_m3Ux"><pre tabindex="0" class="prism-code language-shell codeBlock_qGQc thin-scrollbar"><code class="codeBlockLines_p187"><span class="token-line" style="color:#9CDCFE"><span class="token operator" style="color:rgb(212, 212, 212)">&gt;&gt;</span><span class="token operator" style="color:rgb(212, 212, 212)">&gt;</span><span class="token plain"> from openbb </span><span class="token function" style="color:rgb(220, 220, 170)">import</span><span class="token plain"> obb</span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain"></span><span class="token operator" style="color:rgb(212, 212, 212)">&gt;&gt;</span><span class="token operator" style="color:rgb(212, 212, 212)">&gt;</span><span class="token plain"> obb.user.credentials.some_api_key </span><span class="token operator" style="color:rgb(212, 212, 212)">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(206, 145, 120)">&quot;test&quot;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain"></span><span class="token operator" style="color:rgb(212, 212, 212)">&gt;&gt;</span><span class="token operator" style="color:rgb(212, 212, 212)">&gt;</span><span class="token plain"> obbject </span><span class="token operator" style="color:rgb(212, 212, 212)">=</span><span class="token plain"> obb.equity.price.historical</span><span class="token punctuation" style="color:rgb(212, 212, 212)">(</span><span class="token string" style="color:rgb(206, 145, 120)">&quot;AAPL&quot;</span><span class="token punctuation" style="color:rgb(212, 212, 212)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain"></span><span class="token operator" style="color:rgb(212, 212, 212)">&gt;&gt;</span><span class="token operator" style="color:rgb(212, 212, 212)">&gt;</span><span class="token plain"> obbject.example.hello</span><span class="token punctuation" style="color:rgb(212, 212, 212)">(</span><span class="token punctuation" style="color:rgb(212, 212, 212)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#9CDCFE"><span class="token plain">Hello, this is my credential: test</span><span class="token operator" style="color:rgb(212, 212, 212)">!</span><br></span></code></pre><div class="buttonGroup_6DOT"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>In this example, we have added obbject.example as the extension and can use the .hello() functionality right from our OBBject.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/OpenBB-finance/OpenBBTerminal/edit/main/website/content/platform/development/developer-guidelines/obbject_extensions.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this 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