title: Remove cells from Jupyter Notebook with nbconvert
body: <p>Recommendations mentioned in <a href="https://stackoverflow.com/questions/31517194/how-to-hide-one-specific-cell-input-or-output-in-ipython-notebook">How to hide one specific cell (input or output) in IPython Notebook?</a> don't work.</p>
  
  <p>On Windows I do the following</p>
  
  <pre><code>jupyter nbconvert a.ipynb --TagRemovePreprocessor.remove_cell_tags="{'remove_cell'}"
  </code></pre>
  
  <p>but get an error</p>
  
  <pre><code>traitlets.traitlets.TraitError: The 'remove_cell_tags' trait of a TagRemovePreprocessor instance must be a set, but a value of type 'unicode' (i.e. u"{'remove_cell'}") was specified.
  </code></pre>
  
  <p>I also tried '{"remove_cell"}'</p>
  
  <p>I am using nbconvert 5.4.0</p>
  
  <p>Any ideas how to do this?</p>