title: python mkdir to make folder with subfolder?
body: <p>This works:</p>
  
  <pre><code>mkdir('folder')
  </code></pre>
  
  <p>but this doesn't</p>
  
  <pre><code>mkdir('folder/subfolder')
  </code></pre>
  
  <p>error:</p>
  
  <pre><code>WindowsError: [Error 3] The system cannot find the path specified: 'folder/subfolder'
  </code></pre>