title: is there a way to combine multiple jupyter notebooks into one?
body: <p>i am trying to combine multiple jupyter notebooks into one.
  for instance, copy the content of nb1.ipynb and nb2.ipynb to nb_all.ipynb.</p>
  
  <p>I've searched <a href="https://nbconvert.readthedocs.io/en/latest/api/preprocessors.html?highlight=clearoutput#nbconvert.preprocessors.ClearOutputPreprocessor" rel="nofollow noreferrer">jupyter doc</a>.</p>
  
  <p>there seems to be not an existing api to do this.</p>
  
  <p>any clues?</p>