title: A way to quick preview .ipynb files
body: <p>Got a small basic question. I use a Mac, and I used to work in .py files with Sublime 3. One of the things I liked was that when Sublime is closed, for a given file in a folder--if I'm looking for a bit of code--I could hit the spacebar and Macs open a quick preview of the .py document.</p>
  
  <p>Now I'm working in Jupyter Notebook and saving everything as .ipynb files. Now I can't hit the spacebar and glance at files--I launch JN from the command land and it's far slower.</p>
  
  <p>I suspect there are quicker ways to open .ipynb files in browser windows, but what I really want to know is is there a way to quickly preview those file contents from my desktop? Alternatively, is there a way to work in Jupiter Notebook but save the files as .py (and later seamlessly reopen in JN), such that I could still use the great old spacebar trick?</p>
  
  <p>Thanks for you patience with a pretty small question :) </p>