title: Python black formatter for vscode not formatting
body: <p>I'm trying to use <a href="https://pypi.org/project/black/" rel="noreferrer">black as a formatter</a> for Python on VS Code on Ubuntu 20.04 but it's not working on auto save.</p>
  <p>I've selected <code>black</code> in <code>Python&gt;Formatting:Provider</code>. I'm using prettier as my default formatter for which I added a .prettierignore, disabled, and uninstalled to make sure it wasn't interfering with black. I also added a custom path to <code>./local/bin/black</code>. It works though when I run it through the terminal. How do I make it work?</p>
  <pre><code>{
    editor.defaultFormatter&quot;: &quot;esbenp.prettier-vscode&quot;,
    &quot;editor.formatOnSave&quot;: true,
    &quot;python.formatting.provider&quot;: &quot;black&quot;,
    &quot;python.formatting.blackArgs&quot;: [
      &quot;-l 120&quot;
    ],
    &quot;editor.formatOnType&quot;: true,
    &quot;python.formatting.blackPath&quot;: &quot;./local/bin/black&quot;
  }
  </code></pre>